diff --git a/ports/glutin/lib.rs b/ports/glutin/lib.rs
index 824b151bb8b..4ac0a2c18aa 100644
--- a/ports/glutin/lib.rs
+++ b/ports/glutin/lib.rs
@@ -4,8 +4,11 @@
 
 //! A simple application that uses glutin to open a window for Servo to display in.
 
-#![feature(box_syntax, int_uint)]
-#![allow(unstable)]
+#![feature(int_uint)]
+#![feature(core)]
+#![feature(hash)]
+#![feature(box_syntax)]
+#![feature(libc)]
 
 #[macro_use] extern crate bitflags;
 #[cfg(target_os="macos")]
diff --git a/ports/glutin/window.rs b/ports/glutin/window.rs
index c7707108b48..8fe2f02599b 100644
--- a/ports/glutin/window.rs
+++ b/ports/glutin/window.rs
@@ -47,7 +47,7 @@ static mut g_nested_event_loop_listener: Option<*mut (NestedEventLoopListener +
 
 #[cfg(feature = "window")]
 bitflags! {
-    #[derive(Show)]
+    #[derive(Debug)]
     flags KeyModifiers: u8 {
         const LEFT_CONTROL = 1,
         const RIGHT_CONTROL = 2,