diff --git a/src/test/ui/lint/lint-type-overflow2.rs b/src/test/ui/lint/lint-type-overflow2.rs
index c5fea3cd6caa4..82ec3be15969a 100644
--- a/src/test/ui/lint/lint-type-overflow2.rs
+++ b/src/test/ui/lint/lint-type-overflow2.rs
@@ -7,8 +7,8 @@
 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
-//
 
+// compile-flags: -O
 #![warn(overflowing_literals)]
 #![warn(const_err)]
 // compile-pass