--- a/layout/generic/nsGfxScrollFrame.cpp
+++ b/layout/generic/nsGfxScrollFrame.cpp
@@ -4946,17 +4946,17 @@ ScrollFrameHelper::PostScrollEvent()
   // The ScrollEvent constructor registers itself with the refresh driver.
   mScrollEvent = new ScrollEvent(this);
 }
 
 NS_IMETHODIMP
 ScrollFrameHelper::AsyncScrollPortEvent::Run()
 {
   if (mHelper) {
-    mHelper->mOuter->PresContext()->GetPresShell()->
+    mHelper->mOuter->PresContext()->Document()->
       FlushPendingNotifications(FlushType::InterruptibleLayout);
   }
   return mHelper ? mHelper->FireScrollPortEvent() : NS_OK;
 }
 
 bool
 nsXULScrollFrame::AddHorizontalScrollbar(nsBoxLayoutState& aState, bool aOnBottom)
 {