diff --git a/gc/src/lib.rs b/gc/src/lib.rs
index df472a6..e59be2f 100644
--- a/gc/src/lib.rs
+++ b/gc/src/lib.rs
@@ -6,7 +6,7 @@
 
 #![cfg_attr(
     feature = "nightly",
-    feature(coerce_unsized, optin_builtin_traits, unsize, specialization)
+    feature(coerce_unsized, auto_traits, unsize, specialization)
 )]
 
 use crate::gc::GcBox;