diff --git a/layout/base/nsCSSFrameConstructor.cpp b/layout/base/nsCSSFrameConstructor.cpp
index 744224453274..e1c5f82ad7ff 100644
--- a/layout/base/nsCSSFrameConstructor.cpp
+++ b/layout/base/nsCSSFrameConstructor.cpp
@@ -3987,7 +3987,7 @@ nsCSSFrameConstructor::BuildBlockScrollFrame    (nsIPresContext*          aPresC
 {
   // Create an area container for the frame
   nsIFrame* scrolledFrame;
-  NS_NewAreaFrame(&scrolledFrame, NS_BLOCK_SHRINK_WRAP);
+  NS_NewAreaFrame(&scrolledFrame, NS_BLOCK_SHRINK_WRAP | NS_BLOCK_MARGIN_ROOT);
 
 
   nsresult rv = BuildScrollFrame(aPresContext, aState, aContent, scrolledFrame, aParentFrame,
diff --git a/layout/html/style/src/nsCSSFrameConstructor.cpp b/layout/html/style/src/nsCSSFrameConstructor.cpp
index 744224453274..e1c5f82ad7ff 100644
--- a/layout/html/style/src/nsCSSFrameConstructor.cpp
+++ b/layout/html/style/src/nsCSSFrameConstructor.cpp
@@ -3987,7 +3987,7 @@ nsCSSFrameConstructor::BuildBlockScrollFrame    (nsIPresContext*          aPresC
 {
   // Create an area container for the frame
   nsIFrame* scrolledFrame;
-  NS_NewAreaFrame(&scrolledFrame, NS_BLOCK_SHRINK_WRAP);
+  NS_NewAreaFrame(&scrolledFrame, NS_BLOCK_SHRINK_WRAP | NS_BLOCK_MARGIN_ROOT);
 
 
   nsresult rv = BuildScrollFrame(aPresContext, aState, aContent, scrolledFrame, aParentFrame,