diff --git a/src/bootstrap/sanity.rs b/src/bootstrap/sanity.rs
index 09f96782e7184..d6ac3ef6c9c50 100644
--- a/src/bootstrap/sanity.rs
+++ b/src/bootstrap/sanity.rs
@@ -98,7 +98,8 @@ pub fn check(build: &mut Build) {
         if target.contains("rumprun") ||
            target.contains("bitrig") ||
            target.contains("openbsd") ||
-           target.contains("msvc") {
+           target.contains("msvc") ||
+           target.contains("emscripten") {
             build.config.use_jemalloc = false;
         }
 
diff --git a/src/libstd/sys/unix/mod.rs b/src/libstd/sys/unix/mod.rs
index 1c25c8f77c196..23687e10e476d 100644
--- a/src/libstd/sys/unix/mod.rs
+++ b/src/libstd/sys/unix/mod.rs
@@ -83,11 +83,11 @@ pub fn init() {
         }
     }
 
-    #[cfg(not(target_os = "nacl"))]
+    #[cfg(not(any(target_os = "nacl", target_os = "emscripten")))]
     unsafe fn reset_sigpipe() {
         assert!(signal(libc::SIGPIPE, libc::SIG_IGN) != !0);
     }
-    #[cfg(target_os = "nacl")]
+    #[cfg(any(target_os = "nacl", target_os = "emscripten"))]
     unsafe fn reset_sigpipe() {}
 }
 
diff --git a/src/libstd/sys/unix/os.rs b/src/libstd/sys/unix/os.rs
index 9c57f25dfcce8..c29e87f91c9a7 100644
--- a/src/libstd/sys/unix/os.rs
+++ b/src/libstd/sys/unix/os.rs
@@ -551,11 +551,13 @@ pub fn home_dir() -> Option<PathBuf> {
 
     #[cfg(any(target_os = "android",
               target_os = "ios",
-              target_os = "nacl"))]
+              target_os = "nacl",
+              target_os = "emscripten"))]
     unsafe fn fallback() -> Option<OsString> { None }
     #[cfg(not(any(target_os = "android",
                   target_os = "ios",
-                  target_os = "nacl")))]
+                  target_os = "nacl",
+                  target_os = "emscripten")))]
     unsafe fn fallback() -> Option<OsString> {
         #[cfg(not(target_os = "solaris"))]
         unsafe fn getpwduid_r(me: libc::uid_t, passwd: &mut libc::passwd,
diff --git a/src/libstd/sys/unix/thread.rs b/src/libstd/sys/unix/thread.rs
index 1061ca87f6470..75e10d2585308 100644
--- a/src/libstd/sys/unix/thread.rs
+++ b/src/libstd/sys/unix/thread.rs
@@ -81,8 +81,7 @@ impl Thread {
     }
 
     #[cfg(any(target_os = "linux",
-              target_os = "android",
-              target_os = "emscripten"))]
+              target_os = "android"))]
     pub fn set_name(name: &CStr) {
         const PR_SET_NAME: libc::c_int = 15;
         // pthread wrapper only appeared in glibc 2.12, so we use syscall
@@ -118,9 +117,9 @@ impl Thread {
                                      name.as_ptr() as *mut libc::c_void);
         }
     }
-    #[cfg(any(target_env = "newlib", target_os = "solaris"))]
+    #[cfg(any(target_env = "newlib", target_os = "solaris", target_os = "emscripten"))]
     pub fn set_name(_name: &CStr) {
-        // Newlib and Illumos has no way to set a thread name.
+        // Newlib, Illumos and Emscripten have no way to set a thread name.
     }
 
     pub fn sleep(dur: Duration) {
diff --git a/src/libunwind/libunwind.rs b/src/libunwind/libunwind.rs
index 5e242db0a888d..680ad3ecd64a6 100644
--- a/src/libunwind/libunwind.rs
+++ b/src/libunwind/libunwind.rs
@@ -60,7 +60,6 @@ pub const unwinder_private_data_size: usize = 2;
 pub const unwinder_private_data_size: usize = 2;
 
 #[cfg(target_arch = "asmjs")]
-// FIXME: Copied from arm. Need to confirm.
 pub const unwinder_private_data_size: usize = 20;
 
 #[repr(C)]
diff --git a/src/test/run-pass-fulldeps/linkage-visibility.rs b/src/test/run-pass-fulldeps/linkage-visibility.rs
index e6eaefb049080..f884bb2098eb1 100644
--- a/src/test/run-pass-fulldeps/linkage-visibility.rs
+++ b/src/test/run-pass-fulldeps/linkage-visibility.rs
@@ -12,6 +12,7 @@
 // ignore-android: FIXME(#10356)
 // ignore-windows: std::dynamic_lib does not work on Windows well
 // ignore-musl
+// ignore-emscripten no dynamic linking
 
 extern crate linkage_visibility as foo;
 
diff --git a/src/test/run-pass-fulldeps/logging-enabled.rs b/src/test/run-pass-fulldeps/logging-enabled.rs
index 2975835a27149..26261348020f8 100644
--- a/src/test/run-pass-fulldeps/logging-enabled.rs
+++ b/src/test/run-pass-fulldeps/logging-enabled.rs
@@ -9,6 +9,7 @@
 // except according to those terms.
 
 // exec-env:RUST_LOG=logging_enabled=info
+// ignore-emscripten: FIXME(#31622)
 
 
 #![feature(rustc_private)]
diff --git a/src/test/run-pass-fulldeps/logging-separate-lines.rs b/src/test/run-pass-fulldeps/logging-separate-lines.rs
index 09759326afd91..183a522bba749 100644
--- a/src/test/run-pass-fulldeps/logging-separate-lines.rs
+++ b/src/test/run-pass-fulldeps/logging-separate-lines.rs
@@ -11,6 +11,7 @@
 // ignore-windows
 // exec-env:RUST_LOG=debug
 // compile-flags:-C debug-assertions=y
+// ignore-emscripten: FIXME(#31622)
 
 #![feature(rustc_private)]
 
diff --git a/src/test/run-pass/backtrace-debuginfo.rs b/src/test/run-pass/backtrace-debuginfo.rs
index f42a6ab162b70..838005cbc9119 100644
--- a/src/test/run-pass/backtrace-debuginfo.rs
+++ b/src/test/run-pass/backtrace-debuginfo.rs
@@ -17,6 +17,7 @@
 
 // compile-flags:-g -Cllvm-args=-enable-tail-merge=0
 // ignore-pretty as this critically relies on line numbers
+// ignore-emscripten spawning processes is not supported
 
 use std::io;
 use std::io::prelude::*;
diff --git a/src/test/run-pass/backtrace.rs b/src/test/run-pass/backtrace.rs
index f1ce17c0736b6..f26706d1754e0 100644
--- a/src/test/run-pass/backtrace.rs
+++ b/src/test/run-pass/backtrace.rs
@@ -10,6 +10,7 @@
 
 // no-pretty-expanded FIXME #15189
 // ignore-android FIXME #17520
+// ignore-emscripten spawning processes is not supported
 // compile-flags:-g
 
 use std::env;
diff --git a/src/test/run-pass/command-before-exec.rs b/src/test/run-pass/command-before-exec.rs
index 72f952fb6c0df..5b83ce48e5dad 100644
--- a/src/test/run-pass/command-before-exec.rs
+++ b/src/test/run-pass/command-before-exec.rs
@@ -9,6 +9,7 @@
 // except according to those terms.
 
 // ignore-windows - this is a unix-specific test
+// ignore-emscripten
 
 #![feature(process_exec, libc)]
 
diff --git a/src/test/run-pass/command-exec.rs b/src/test/run-pass/command-exec.rs
index 039245bfd08ba..130526e72b19c 100644
--- a/src/test/run-pass/command-exec.rs
+++ b/src/test/run-pass/command-exec.rs
@@ -9,6 +9,7 @@
 // except according to those terms.
 
 // ignore-windows - this is a unix-specific test
+// ignore-emscripten
 // ignore-pretty
 
 #![feature(process_exec)]
diff --git a/src/test/run-pass/drop-flag-sanity-check.rs b/src/test/run-pass/drop-flag-sanity-check.rs
index f9e1b651a4933..a8014768d7847 100644
--- a/src/test/run-pass/drop-flag-sanity-check.rs
+++ b/src/test/run-pass/drop-flag-sanity-check.rs
@@ -9,6 +9,7 @@
 // except according to those terms.
 
 // compile-flags: -Z force-dropflag-checks=on
+// ignore-emscripten
 
 // Quick-and-dirty test to ensure -Z force-dropflag-checks=on works as
 // expected. Note that the inlined drop-flag is slated for removal
diff --git a/src/test/run-pass/drop-trait-enum.rs b/src/test/run-pass/drop-trait-enum.rs
index ce675547a6819..912cb4c5e8775 100644
--- a/src/test/run-pass/drop-trait-enum.rs
+++ b/src/test/run-pass/drop-trait-enum.rs
@@ -8,6 +8,8 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+// ignore-emscripten no threads support
+
 #![allow(unknown_features)]
 #![feature(box_syntax)]
 
diff --git a/src/test/run-pass/env-args-reverse-iterator.rs b/src/test/run-pass/env-args-reverse-iterator.rs
index d22fa6494f036..89af1db7c78f1 100644
--- a/src/test/run-pass/env-args-reverse-iterator.rs
+++ b/src/test/run-pass/env-args-reverse-iterator.rs
@@ -8,6 +8,8 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+// ignore-emscripten
+
 use std::env::args;
 use std::process::Command;
 
diff --git a/src/test/run-pass/env-home-dir.rs b/src/test/run-pass/env-home-dir.rs
index 2110f0b3bf9d6..bcb0c62d9fef4 100644
--- a/src/test/run-pass/env-home-dir.rs
+++ b/src/test/run-pass/env-home-dir.rs
@@ -8,6 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+// ignore-emscripten
 
 #![feature(path)]
 
diff --git a/src/test/run-pass/exec-env.rs b/src/test/run-pass/exec-env.rs
index d17056e6d799d..a96d189afaa86 100644
--- a/src/test/run-pass/exec-env.rs
+++ b/src/test/run-pass/exec-env.rs
@@ -9,7 +9,7 @@
 // except according to those terms.
 
 // exec-env:TEST_EXEC_ENV=22
-
+// ignore-emscripten FIXME: issue #31622
 
 use std::env;
 
diff --git a/src/test/run-pass/hashmap-memory.rs b/src/test/run-pass/hashmap-memory.rs
index 3f6f1aa6b5fe3..8efc4cb1b1725 100644
--- a/src/test/run-pass/hashmap-memory.rs
+++ b/src/test/run-pass/hashmap-memory.rs
@@ -8,6 +8,8 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+// ignore-emscripten No support for threads
+
 #![allow(unknown_features)]
 #![feature(std_misc)]
 
diff --git a/src/test/run-pass/intrinsic-alignment.rs b/src/test/run-pass/intrinsic-alignment.rs
index f1e4f8dfa8c83..cfae9903a95e5 100644
--- a/src/test/run-pass/intrinsic-alignment.rs
+++ b/src/test/run-pass/intrinsic-alignment.rs
@@ -24,7 +24,8 @@ mod rusti {
           target_os = "dragonfly",
           target_os = "netbsd",
           target_os = "openbsd",
-          target_os = "solaris"))]
+          target_os = "solaris",
+          target_os = "emscripten"))]
 mod m {
     #[main]
     #[cfg(target_arch = "x86")]
diff --git a/src/test/run-pass/issue-10626.rs b/src/test/run-pass/issue-10626.rs
index c81e16ebb7c60..b350bd1a4ccbf 100644
--- a/src/test/run-pass/issue-10626.rs
+++ b/src/test/run-pass/issue-10626.rs
@@ -8,6 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+// ignore-emscripten
 
 // Make sure that if a process doesn't have its stdio/stderr descriptors set up
 // that we don't die in a large ball of fire
diff --git a/src/test/run-pass/issue-12133-3.rs b/src/test/run-pass/issue-12133-3.rs
index 66201ff901f30..8f455c2fe4e1e 100644
--- a/src/test/run-pass/issue-12133-3.rs
+++ b/src/test/run-pass/issue-12133-3.rs
@@ -12,6 +12,7 @@
 // aux-build:issue-12133-dylib.rs
 // aux-build:issue-12133-dylib2.rs
 // ignore-musl
+// ignore-emscripten no dylib support
 
 // pretty-expanded FIXME #23616
 
diff --git a/src/test/run-pass/issue-13304.rs b/src/test/run-pass/issue-13304.rs
index c260aa95b57f1..e1c2c5684fb5f 100644
--- a/src/test/run-pass/issue-13304.rs
+++ b/src/test/run-pass/issue-13304.rs
@@ -9,6 +9,7 @@
 // except according to those terms.
 
 // ignore-aarch64
+// ignore-emscripten
 #![feature(io, process_capture)]
 
 use std::env;
diff --git a/src/test/run-pass/issue-14456.rs b/src/test/run-pass/issue-14456.rs
index 7e24c8f73ab70..513ab91489c8d 100644
--- a/src/test/run-pass/issue-14456.rs
+++ b/src/test/run-pass/issue-14456.rs
@@ -8,6 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+// ignore-emscripten
 
 #![feature(io, process_capture)]
 
diff --git a/src/test/run-pass/issue-14940.rs b/src/test/run-pass/issue-14940.rs
index ba6815d5b7c69..ffe6b646794e1 100644
--- a/src/test/run-pass/issue-14940.rs
+++ b/src/test/run-pass/issue-14940.rs
@@ -8,6 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+// ignore-emscripten
 
 use std::env;
 use std::process::Command;
diff --git a/src/test/run-pass/issue-16272.rs b/src/test/run-pass/issue-16272.rs
index 9562d113ada70..d4f3d15b320d7 100644
--- a/src/test/run-pass/issue-16272.rs
+++ b/src/test/run-pass/issue-16272.rs
@@ -9,6 +9,7 @@
 // except according to those terms.
 
 // ignore-aarch64
+// ignore-emscripten
 
 use std::process::Command;
 use std::env;
diff --git a/src/test/run-pass/issue-20091.rs b/src/test/run-pass/issue-20091.rs
index 1fe443484665b..52c7911075ae9 100644
--- a/src/test/run-pass/issue-20091.rs
+++ b/src/test/run-pass/issue-20091.rs
@@ -9,6 +9,7 @@
 // except according to those terms.
 
 // ignore-aarch64
+// ignore-emscripten
 #![feature(std_misc, os)]
 
 #[cfg(unix)]
diff --git a/src/test/run-pass/issue-2190-1.rs b/src/test/run-pass/issue-2190-1.rs
index 844826c45db92..393757035141d 100644
--- a/src/test/run-pass/issue-2190-1.rs
+++ b/src/test/run-pass/issue-2190-1.rs
@@ -9,6 +9,7 @@
 // except according to those terms.
 
 // pretty-expanded FIXME #23616
+// ignore-emscripten
 
 use std::thread::Builder;
 
diff --git a/src/test/run-pass/issue-24313.rs b/src/test/run-pass/issue-24313.rs
index 9acfb04d781e0..9b2b474351df6 100644
--- a/src/test/run-pass/issue-24313.rs
+++ b/src/test/run-pass/issue-24313.rs
@@ -8,6 +8,8 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+// ignore-emscripten
+
 use std::thread;
 use std::env;
 use std::process::Command;
diff --git a/src/test/run-pass/issue-28950.rs b/src/test/run-pass/issue-28950.rs
index efce148ea51d4..a905727afff4f 100644
--- a/src/test/run-pass/issue-28950.rs
+++ b/src/test/run-pass/issue-28950.rs
@@ -8,6 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+// ignore-emscripten
 // compile-flags: -Z orbit=off
 // (blows the stack with MIR trans and no optimizations)
 
diff --git a/src/test/run-pass/issue-29485.rs b/src/test/run-pass/issue-29485.rs
index 9e8f58694377a..9252762d1bdad 100644
--- a/src/test/run-pass/issue-29485.rs
+++ b/src/test/run-pass/issue-29485.rs
@@ -9,6 +9,7 @@
 // except according to those terms.
 
 // aux-build:issue-29485.rs
+// ignore-emscripten
 
 #[feature(recover)]
 
diff --git a/src/test/run-pass/issue-30490.rs b/src/test/run-pass/issue-30490.rs
index ea603fc665dda..035911302cf24 100644
--- a/src/test/run-pass/issue-30490.rs
+++ b/src/test/run-pass/issue-30490.rs
@@ -8,6 +8,8 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+// ignore-emscripten
+
 // Previously libstd would set stdio descriptors of a child process
 // by `dup`ing the requested descriptors to inherit directly into the
 // stdio descriptors. This, however, would incorrectly handle cases
diff --git a/src/test/run-pass/issue-33770.rs b/src/test/run-pass/issue-33770.rs
index f5635fddaf951..76728a0d354b2 100644
--- a/src/test/run-pass/issue-33770.rs
+++ b/src/test/run-pass/issue-33770.rs
@@ -8,6 +8,8 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+// ignore-emscripten
+
 use std::process::{Command, Stdio};
 use std::env;
 use std::sync::{Mutex, RwLock};
diff --git a/src/test/run-pass/linkage1.rs b/src/test/run-pass/linkage1.rs
index 0794a5e0daf2f..17abf9cb1f251 100644
--- a/src/test/run-pass/linkage1.rs
+++ b/src/test/run-pass/linkage1.rs
@@ -10,6 +10,7 @@
 
 // ignore-windows
 // ignore-macos
+// ignore-emscripten
 // aux-build:linkage1.rs
 
 #![feature(linkage)]
diff --git a/src/test/run-pass/multi-panic.rs b/src/test/run-pass/multi-panic.rs
index 93e2a854ccb2a..86fe06b176532 100644
--- a/src/test/run-pass/multi-panic.rs
+++ b/src/test/run-pass/multi-panic.rs
@@ -8,6 +8,8 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+// ignore-emscripten
+
 fn check_for_no_backtrace(test: std::process::Output) {
     assert!(!test.status.success());
     let err = String::from_utf8_lossy(&test.stderr);
diff --git a/src/test/run-pass/no-stdio.rs b/src/test/run-pass/no-stdio.rs
index 3658b6a508ab2..ad4d56ec50ac0 100644
--- a/src/test/run-pass/no-stdio.rs
+++ b/src/test/run-pass/no-stdio.rs
@@ -8,6 +8,8 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+// ignore-emscripten
+
 #![feature(libc)]
 
 extern crate libc;
diff --git a/src/test/run-pass/panic-handler-chain.rs b/src/test/run-pass/panic-handler-chain.rs
index 7c2e3f0c91baf..1ad43f5f17fb9 100644
--- a/src/test/run-pass/panic-handler-chain.rs
+++ b/src/test/run-pass/panic-handler-chain.rs
@@ -7,6 +7,9 @@
 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
+
+// ignore-emscripten no threads support
+
 #![feature(panic_handler, const_fn, std_panic)]
 
 use std::sync::atomic::{AtomicUsize, Ordering};
diff --git a/src/test/run-pass/process-exit.rs b/src/test/run-pass/process-exit.rs
index 9ef66ff2d713c..a5d408448a033 100644
--- a/src/test/run-pass/process-exit.rs
+++ b/src/test/run-pass/process-exit.rs
@@ -8,6 +8,8 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+// ignore-emscripten
+
 use std::env;
 use std::process::{self, Command, Stdio};
 
diff --git a/src/test/run-pass/process-remove-from-env.rs b/src/test/run-pass/process-remove-from-env.rs
index 3096fe4a266c9..cce5ef4fe17c3 100644
--- a/src/test/run-pass/process-remove-from-env.rs
+++ b/src/test/run-pass/process-remove-from-env.rs
@@ -8,6 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+// ignore-emscripten
 
 use std::process::Command;
 use std::env;
diff --git a/src/test/run-pass/process-spawn-with-unicode-params.rs b/src/test/run-pass/process-spawn-with-unicode-params.rs
index a155ee396b614..d3d847127ee95 100644
--- a/src/test/run-pass/process-spawn-with-unicode-params.rs
+++ b/src/test/run-pass/process-spawn-with-unicode-params.rs
@@ -17,6 +17,7 @@
 // intact.
 
 // ignore-aarch64
+// ignore-emscripten
 
 use std::io::prelude::*;
 use std::io;
diff --git a/src/test/run-pass/rec-align-u64.rs b/src/test/run-pass/rec-align-u64.rs
index 2161864f0b696..4863979b3f6c2 100644
--- a/src/test/run-pass/rec-align-u64.rs
+++ b/src/test/run-pass/rec-align-u64.rs
@@ -42,7 +42,8 @@ struct Outer {
           target_os = "dragonfly",
           target_os = "netbsd",
           target_os = "openbsd",
-          target_os = "solaris"))]
+          target_os = "solaris",
+          target_os = "emscripten"))]
 mod m {
     #[cfg(target_arch = "x86")]
     pub mod m {
diff --git a/src/test/run-pass/running-with-no-runtime.rs b/src/test/run-pass/running-with-no-runtime.rs
index 23d5a08e21644..f81c3f2e99d36 100644
--- a/src/test/run-pass/running-with-no-runtime.rs
+++ b/src/test/run-pass/running-with-no-runtime.rs
@@ -8,6 +8,8 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+// ignore-emscripten
+
 #![feature(start)]
 
 use std::ffi::CStr;
diff --git a/src/test/run-pass/segfault-no-out-of-stack.rs b/src/test/run-pass/segfault-no-out-of-stack.rs
index 0158c4282dae7..df64d7140b4b5 100644
--- a/src/test/run-pass/segfault-no-out-of-stack.rs
+++ b/src/test/run-pass/segfault-no-out-of-stack.rs
@@ -8,6 +8,8 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+// ignore-emscripten can't run commands
+
 #![feature(libc)]
 
 extern crate libc;
diff --git a/src/test/run-pass/signal-exit-status.rs b/src/test/run-pass/signal-exit-status.rs
index 51b369092f0f4..c7759ca743bbb 100644
--- a/src/test/run-pass/signal-exit-status.rs
+++ b/src/test/run-pass/signal-exit-status.rs
@@ -9,6 +9,7 @@
 // except according to those terms.
 
 // ignore-windows
+// ignore-emscripten
 
 use std::env;
 use std::process::Command;
diff --git a/src/test/run-pass/sigpipe-should-be-ignored.rs b/src/test/run-pass/sigpipe-should-be-ignored.rs
index 7734a2e80c3c4..4eb4720e8d7be 100644
--- a/src/test/run-pass/sigpipe-should-be-ignored.rs
+++ b/src/test/run-pass/sigpipe-should-be-ignored.rs
@@ -12,6 +12,7 @@
 // doesn't die in a ball of fire, but rather it's gracefully handled.
 
 // ignore-aarch64
+// ignore-emscripten
 
 use std::env;
 use std::io::prelude::*;
diff --git a/src/test/run-pass/sleep.rs b/src/test/run-pass/sleep.rs
index 8b06b02f3cba5..9acc6ff8cf084 100644
--- a/src/test/run-pass/sleep.rs
+++ b/src/test/run-pass/sleep.rs
@@ -8,6 +8,8 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+// ignore-emscripten no threads support
+
 use std::thread::{self, sleep};
 use std::time::Duration;
 use std::sync::{Arc, Mutex};
diff --git a/src/test/run-pass/wait-forked-but-failed-child.rs b/src/test/run-pass/wait-forked-but-failed-child.rs
index 795c3f46f7579..1d1c83cf12a15 100644
--- a/src/test/run-pass/wait-forked-but-failed-child.rs
+++ b/src/test/run-pass/wait-forked-but-failed-child.rs
@@ -8,6 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+// ignore-emscripten
 
 #![feature(libc)]