diff --git a/tests/run-pass/specialization.rs b/tests/run-pass/specialization.rs
index 9570b5b58e8..13894926d36 100644
--- a/tests/run-pass/specialization.rs
+++ b/tests/run-pass/specialization.rs
@@ -1,3 +1,5 @@
+#![feature(specialization)]
+
 trait IsUnit {
     fn is_unit() -> bool;
 }