diff --git a/build_system/tests.rs b/build_system/tests.rs
index ff71a567ed3..f6e6ac6f1e8 100644
--- a/build_system/tests.rs
+++ b/build_system/tests.rs
@@ -457,6 +457,7 @@ fn rustc_command<I, S>(&self, args: I) -> Command
         cmd.arg("--target");
         cmd.arg(&self.target_compiler.triple);
         cmd.arg("-Cpanic=abort");
+        cmd.arg("-Zunstable-options");
         cmd.arg("--check-cfg=cfg(no_unstable_features)");
         cmd.arg("--check-cfg=cfg(jit)");
         cmd.args(args);