diff --git a/layout/base/nsCSSRendering.cpp b/layout/base/nsCSSRendering.cpp
index 0ec4f9f2c49..2bc68d3b0e8 100644
--- a/layout/base/nsCSSRendering.cpp
+++ b/layout/base/nsCSSRendering.cpp
@@ -1053,8 +1053,7 @@ NumBorderPasses (PRUint8 *borderStyles,
       case NS_STYLE_BORDER_STYLE_OUTSET:
       case NS_STYLE_BORDER_STYLE_GROOVE:
       case NS_STYLE_BORDER_STYLE_RIDGE:
-        /* XXX See bug 397303 why this is 4 instead of 2; this could be optimized further */
-        numBorderPasses = 4;
+        numBorderPasses = 2;
         break;
 
       case NS_STYLE_BORDER_STYLE_SOLID: