diff --git a/mozilla/gfx/src/gtk/nsImageGTK.cpp b/mozilla/gfx/src/gtk/nsImageGTK.cpp
index 23185471ac8..a455c7c9d1f 100644
--- a/mozilla/gfx/src/gtk/nsImageGTK.cpp
+++ b/mozilla/gfx/src/gtk/nsImageGTK.cpp
@@ -1350,7 +1350,7 @@ nsImageGTK::SetDecodedRect(PRInt32 x1, PRInt32 y1, PRInt32 x2, PRInt32 y2 )
       for (int x=mDecodedX1; x<mDecodedX2; x++)
         if (*(alpha++)!=255) {
           mAlphaValid=PR_TRUE;
-          return;
+          return NS_OK;
         }
     }
   }