diff --git a/src/components/script/dom/progressevent.rs b/src/components/script/dom/progressevent.rs
index 8f2710b49f4..109371d1453 100644
--- a/src/components/script/dom/progressevent.rs
+++ b/src/components/script/dom/progressevent.rs
@@ -41,7 +41,7 @@ impl ProgressEvent {
                            ProgressEventBinding::Wrap)
     }
     pub fn Constructor(owner: &JSRef<Window>,
-                       type_: DOMString,
+                       _type: DOMString,
                        init: &ProgressEventBinding::ProgressEventInit)
                        -> Fallible<Temporary<ProgressEvent>> {
         let ev = ProgressEvent::new(owner, init.lengthComputable, init.loaded, init.total);