diff --git a/mk/main.mk b/mk/main.mk
index 9936c5b59be5c..dd3bc2f21d738 100644
--- a/mk/main.mk
+++ b/mk/main.mk
@@ -378,10 +378,6 @@ ifdef CFG_MUSL_ROOT
 export CFG_MUSL_ROOT
 endif
 
-# FIXME: Transitionary measure to bootstrap using the old bootstrap logic.
-# Remove this once the bootstrap compiler uses the new login in Issue #36548.
-export RUSTC_BOOTSTRAP_KEY=62b3e239
-
 ######################################################################
 # Per-stage targets and runner
 ######################################################################
diff --git a/src/bootstrap/lib.rs b/src/bootstrap/lib.rs
index 03c74ff081ae0..d3876865851fa 100644
--- a/src/bootstrap/lib.rs
+++ b/src/bootstrap/lib.rs
@@ -658,9 +658,6 @@ impl Build {
     /// Adds the compiler's bootstrap key to the environment of `cmd`.
     fn add_bootstrap_key(&self, cmd: &mut Command) {
         cmd.env("RUSTC_BOOTSTRAP", "1");
-        // FIXME: Transitionary measure to bootstrap using the old bootstrap logic.
-        // Remove this once the bootstrap compiler uses the new login in Issue #36548.
-        cmd.env("RUSTC_BOOTSTRAP_KEY", "62b3e239");
     }
 
     /// Returns the compiler's libdir where it stores the dynamic libraries that