diff --git a/gfx/thebes/gfxUtils.cpp b/gfx/thebes/gfxUtils.cpp
index 3567412a6..3eb357f5a 100644
--- a/gfx/thebes/gfxUtils.cpp
+++ b/gfx/thebes/gfxUtils.cpp
@@ -337,8 +337,7 @@ gfxUtils::CreatePremultipliedDataSurface(DataSourceSurface* srcSurf)
     DataSourceSurface::MappedSurface destMap;
     if (!MapSrcAndCreateMappedDest(srcSurf, &destSurf, &srcMap, &destMap)) {
         MOZ_ASSERT(false, "MapSrcAndCreateMappedDest failed.");
-        RefPtr<DataSourceSurface> surface(srcSurf);
-        return surface.forget();
+        return nullptr;
     }
 
     PremultiplyData(srcMap.mData, srcMap.mStride,
@@ -358,8 +357,7 @@ gfxUtils::CreateUnpremultipliedDataSurface(DataSourceSurface* srcSurf)
     DataSourceSurface::MappedSurface destMap;
     if (!MapSrcAndCreateMappedDest(srcSurf, &destSurf, &srcMap, &destMap)) {
         MOZ_ASSERT(false, "MapSrcAndCreateMappedDest failed.");
-        RefPtr<DataSourceSurface> surface(srcSurf);
-        return surface.forget();
+        return nullptr;
     }
 
     UnpremultiplyData(srcMap.mData, srcMap.mStride,