diff --git a/components/canvas/lib.rs b/components/canvas/lib.rs
index b8ec951bbef7..7338fffc7783 100644
--- a/components/canvas/lib.rs
+++ b/components/canvas/lib.rs
@@ -2,7 +2,6 @@
  * 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)]
 #![feature(nonzero)]
 #![feature(slice_bytes)]
 #![feature(vec_push_all)]
diff --git a/components/canvas_traits/lib.rs b/components/canvas_traits/lib.rs
index f13879e0cea3..0df30dbb4597 100644
--- a/components/canvas_traits/lib.rs
+++ b/components/canvas_traits/lib.rs
@@ -4,7 +4,6 @@
 
 #![crate_name = "canvas_traits"]
 #![crate_type = "rlib"]
-#![feature(core)]
 #![feature(custom_derive)]
 #![feature(nonzero)]
 #![feature(plugin)]