diff --git a/examples/server.rs b/examples/server.rs
index cfa61582b0..ca270dfc76 100644
--- a/examples/server.rs
+++ b/examples/server.rs
@@ -1,4 +1,4 @@
-#![feature(core, io)]
+#![feature(io)]
 extern crate hyper;
 #[macro_use] extern crate log;