diff --git a/layout/base/nsCSSRendering.cpp b/layout/base/nsCSSRendering.cpp
index f6d6266fe373..eaf89e6947fe 100644
--- a/layout/base/nsCSSRendering.cpp
+++ b/layout/base/nsCSSRendering.cpp
@@ -1315,7 +1315,7 @@ nsCSSRendering::PaintBackgroundWithSC(nsPresContext* aPresContext,
       drawBackgroundColor = PR_FALSE;
   } else {
     bgColor = NS_RGB(255, 255, 255);
-    if (drawBackgroundImage || NS_GET_A(aColor.mBackgroundColor) > 0)
+    if (drawBackgroundImage || !aColor.IsTransparent())
       drawBackgroundColor = PR_TRUE;
   }