diff --git a/layout/base/public/nsIFrameImageLoader.h b/layout/base/public/nsIFrameImageLoader.h
index 7a3e13cdb8c1..8f010bd4ed79 100644
--- a/layout/base/public/nsIFrameImageLoader.h
+++ b/layout/base/public/nsIFrameImageLoader.h
@@ -102,6 +102,7 @@ public:
   // Return the intrinsic (or natural) size of the image, in twips.
   // Returns 0,0 if the dimensions are unknown
   NS_IMETHOD GetIntrinsicSize(nsSize& aResult) = 0;
+  NS_IMETHOD GetNaturalImageSize(PRUint32* naturalWidth, PRUint32 *naturalHeight) = 0;
 };
 
 // Image load status bit values