diff --git a/src/servo-gfx/resource/image_cache_task.rs b/src/servo-gfx/resource/image_cache_task.rs
index aa42c9e9c0c..9229100e8f9 100644
--- a/src/servo-gfx/resource/image_cache_task.rs
+++ b/src/servo-gfx/resource/image_cache_task.rs
@@ -377,7 +377,8 @@ impl ImageCache {
 
     priv fn purge_waiters(url: Url, f: fn() -> ImageResponseMsg) {
         match self.wait_map.find(copy url) {
-          Some(@ref mut waiters) => {
+          Some(waiters) => {
+            let waiters = &mut *waiters;
             let mut new_waiters = ~[];
             new_waiters <-> *waiters;