diff --git a/tests/codegen/simd/repr-packed.rs b/tests/codegen/simd/repr-packed.rs
index 7176a5485bd6..4bcf50dda13c 100644
--- a/tests/codegen/simd/repr-packed.rs
+++ b/tests/codegen/simd/repr-packed.rs
@@ -1,3 +1,4 @@
+// compile-flags: -C opt-level=3
 #![crate_type = "lib"]
 #![feature(repr_simd, platform_intrinsics)]