diff --git a/src/test/ui/consts/const_discriminant.rs b/src/test/ui/consts/const_discriminant.rs
index 9aac3c4532f..c67be3c3713 100644
--- a/src/test/ui/consts/const_discriminant.rs
+++ b/src/test/ui/consts/const_discriminant.rs
@@ -1,5 +1,6 @@
 // run-pass
 #![feature(const_discriminant)]
+#![allow(dead_code)]
 
 use std::mem::{discriminant, Discriminant};