diff --git a/library/std/src/sys/unix/thread.rs b/library/std/src/sys/unix/thread.rs
index e667f34aece05..151cd812a59a6 100644
--- a/library/std/src/sys/unix/thread.rs
+++ b/library/std/src/sys/unix/thread.rs
@@ -375,29 +375,6 @@ pub fn available_parallelism() -> io::Result<NonZeroUsize> {
                 }
             }
 
-            #[cfg(target_os = "netbsd")]
-            {
-                unsafe {
-                    let set = libc::_cpuset_create();
-                    if !set.is_null() {
-                        let mut count: usize = 0;
-                        if libc::pthread_getaffinity_np(libc::pthread_self(), libc::_cpuset_size(set), set) == 0 {
-                            for i in 0..u64::MAX {
-                                match libc::_cpuset_isset(i, set) {
-                                    -1 => break,
-                                    0 => continue,
-                                    _ => count = count + 1,
-                                }
-                            }
-                        }
-                        libc::_cpuset_destroy(set);
-                        if let Some(count) = NonZeroUsize::new(count) {
-                            return Ok(count);
-                        }
-                    }
-                }
-            }
-
             let mut cpus: libc::c_uint = 0;
             let mut cpus_size = crate::mem::size_of_val(&cpus);