diff --git a/du/du.rs b/du/du.rs
index 903a87fb4..8c9e71e5e 100644
--- a/du/du.rs
+++ b/du/du.rs
@@ -9,6 +9,7 @@
  * file that was distributed with this source code.
  */
 
+#[allow(uppercase_variables)];
 #[feature(macro_rules)];
 
 extern crate getopts;