diff --git a/src/test/ui/consts/cast-discriminant-zst-enum.rs b/src/test/ui/consts/cast-discriminant-zst-enum.rs
index 743043609ec3..9c02d232e134 100644
--- a/src/test/ui/consts/cast-discriminant-zst-enum.rs
+++ b/src/test/ui/consts/cast-discriminant-zst-enum.rs
@@ -1,5 +1,6 @@
 // run-pass
 // Test a ZST enum whose dicriminant is ~0i128. This caused an ICE when casting to a i32.
+#![feature(test)]
 use std::hint::black_box;
 
 #[derive(Copy, Clone)]