diff --git a/test_suite/tests/test.rs b/test_suite/tests/test.rs
index cf0ae04..a2c20bb 100644
--- a/test_suite/tests/test.rs
+++ b/test_suite/tests/test.rs
@@ -1,4 +1,4 @@
-#![cfg_attr(const_unstable, feature(const_fn, const_extern_fn))]
+#![cfg_attr(const_unstable, feature(const_extern_fn, const_fn_trait_bound))]
 #![warn(rust_2018_idioms, single_use_lifetimes)]
 #![allow(clippy::missing_safety_doc)] // this is test