diff --git a/src/test/ui/issues/issue-66308.rs b/src/test/ui/issues/issue-66308.rs
index 5dc9378422cf..8460b359ae38 100644
--- a/src/test/ui/issues/issue-66308.rs
+++ b/src/test/ui/issues/issue-66308.rs
@@ -1,5 +1,5 @@
 // build-pass
-// compile-flags: --crate-type lib
+// compile-flags: --crate-type lib -C opt-level=0
 
 // Regression test for LLVM crash affecting Emscripten targets