diff --git a/sync/src/lib.rs b/sync/src/lib.rs
index 2be662b65..d6bce2447 100644
--- a/sync/src/lib.rs
+++ b/sync/src/lib.rs
@@ -17,7 +17,6 @@
 #![warn(missing_docs)]
 #![cfg_attr(feature="dev", feature(plugin))]
 #![cfg_attr(feature="dev", plugin(clippy))]
-//#![feature(augmented_assignments)]
 // Keeps consistency (all lines with `.clone()`) and helpful when changing ref to non-ref.
 #![allow(clone_on_copy)]