diff --git a/components/layout/lib.rs b/components/layout/lib.rs
index 2891e1cdae7e..174125c3fd95 100644
--- a/components/layout/lib.rs
+++ b/components/layout/lib.rs
@@ -4,7 +4,6 @@
 
 #![feature(as_unsafe_cell)]
 #![feature(box_syntax)]
-#![feature(cell_extras)]
 #![feature(custom_derive)]
 #![feature(mpsc_select)]
 #![feature(nonzero)]
diff --git a/components/script/lib.rs b/components/script/lib.rs
index 007877ff3e9c..bee43944c69c 100644
--- a/components/script/lib.rs
+++ b/components/script/lib.rs
@@ -6,7 +6,6 @@
 #![feature(as_unsafe_cell)]
 #![feature(borrow_state)]
 #![feature(box_syntax)]
-#![feature(cell_extras)]
 #![feature(const_fn)]
 #![feature(core_intrinsics)]
 #![feature(custom_attribute)]
diff --git a/components/style/lib.rs b/components/style/lib.rs
index 901fa85e5702..3d9f7f140146 100644
--- a/components/style/lib.rs
+++ b/components/style/lib.rs
@@ -4,7 +4,6 @@
 
 #![feature(box_syntax)]
 #![feature(box_patterns)]
-#![feature(cell_extras)]
 #![feature(concat_idents)]
 #![feature(core_intrinsics)]
 #![feature(custom_attribute)]