--- a/modules/libpr0n/src/VectorImage.cpp
+++ b/modules/libpr0n/src/VectorImage.cpp
@@ -682,16 +682,17 @@ VectorImage::OnStopRequest(nsIRequest* a
   if (observer) {
     // NOTE: This signals that width/height are available.
     observer->OnStartContainer(nsnull, this);
 
     observer->FrameChanged(this, &nsIntRect::GetMaxSizedIntRect());
     observer->OnStopFrame(nsnull, 0);
     observer->OnStopDecode(nsnull, NS_OK, nsnull);
   }
+  EvaluateAnimation();
 
   return rv;
 }
 
 //------------------------------------------------------------------------------
 // nsIStreamListener method
 
 //******************************************************************************