diff --git a/src/libstd/lib.rs b/src/libstd/lib.rs
index 784f5eecf0b..907eb3ed401 100644
--- a/src/libstd/lib.rs
+++ b/src/libstd/lib.rs
@@ -203,6 +203,7 @@
        test(no_crate_inject, attr(deny(warnings))),
        test(attr(allow(dead_code, deprecated, unused_variables, unused_mut))))]
 
+#![cfg_attr(stage0, allow(unused_features))]
 #![feature(alloc)]
 #![feature(allow_internal_unstable)]
 #![feature(associated_consts)]