diff --git a/components/canvas/lib.rs b/components/canvas/lib.rs
index 3e8350b8c37..af26c94d3ba 100644
--- a/components/canvas/lib.rs
+++ b/components/canvas/lib.rs
@@ -2,8 +2,9 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
+#![feature(core)]
+
 #![allow(missing_copy_implementations)]
-#![allow(unstable)]
 
 extern crate azure;
 extern crate geom;