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-rw-r--r--src/bootstrap/check.rs1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/bootstrap/check.rs b/src/bootstrap/check.rs
index 0d3cc2e0b1b..068efe18cce 100644
--- a/src/bootstrap/check.rs
+++ b/src/bootstrap/check.rs
@@ -672,6 +672,7 @@ pub fn bootstrap(build: &Build) {
     cmd.arg("test")
        .current_dir(build.src.join("src/bootstrap"))
        .env("CARGO_TARGET_DIR", build.out.join("bootstrap"))
+       .env("RUSTC_BOOTSTRAP", "1")
        .env("RUSTC", &build.rustc);
     if build.flags.cmd.no_fail_fast() {
         cmd.arg("--no-fail-fast");