diff --git a/ports/cef/lib.rs b/ports/cef/lib.rs
index a4e12301137..c84879937f3 100644
--- a/ports/cef/lib.rs
+++ b/ports/cef/lib.rs
@@ -5,6 +5,7 @@
 #![feature(globs, macro_rules, phase, thread_local, link_args)]
 
 #![allow(experimental, non_camel_case_types)]
+#![deny(unused_imports, unused_variable, unused_mut)]
 
 #![feature(phase)]
 #[phase(plugin, link)]