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-rw-r--r--src/bootstrap/lib.rs2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/bootstrap/lib.rs b/src/bootstrap/lib.rs
index 7c5a0c7373f..fdd7a1ec57d 100644
--- a/src/bootstrap/lib.rs
+++ b/src/bootstrap/lib.rs
@@ -873,7 +873,7 @@ 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", "");
+        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");