diff --git a/macros/src/lib.rs b/macros/src/lib.rs
index 161282d6..fd76e10e 100644
--- a/macros/src/lib.rs
+++ b/macros/src/lib.rs
@@ -11,7 +11,7 @@
 #![crate_type="dylib"]
 
 #![feature(plugin_registrar, quote)]
-#![feature(rustc_private, core, collections, std_misc)]
+#![feature(rustc_private, core, std_misc)]
 #![deny(warnings)]
 
 extern crate syntax;