diff --git a/modules/libpr0n/src/imgContainer.cpp b/modules/libpr0n/src/imgContainer.cpp
index 0ded48408bf4..e143ef4f3e24 100644
--- a/modules/libpr0n/src/imgContainer.cpp
+++ b/modules/libpr0n/src/imgContainer.cpp
@@ -1624,7 +1624,8 @@ nsresult imgContainer::DoComposite(imgFrame** aFrameToUse,
       return rv;
     }
     needToBlankComposite = PR_TRUE;
-  } else if (aNextFrameIndex == 1) {
+  } else if (aNextFrameIndex != mAnim->lastCompositedFrameIndex+1) {
+
     // When we are looping the compositing frame needs to be cleared.
     needToBlankComposite = PR_TRUE;
   }