--- a/layout/generic/nsGfxScrollFrame.cpp
+++ b/layout/generic/nsGfxScrollFrame.cpp
@@ -4375,31 +4375,31 @@ void ScrollFrameHelper::CurPosAttributeC
 }
 
 /* ============= Scroll events ========== */
 
 ScrollFrameHelper::ScrollEvent::ScrollEvent(ScrollFrameHelper* aHelper)
   : mHelper(aHelper)
 {
   mDriver = mHelper->mOuter->PresContext()->RefreshDriver();
-  mDriver->AddRefreshObserver(this, Flush_Style);
+  mDriver->AddRefreshObserver(this, Flush_Layout);
 }
 
 ScrollFrameHelper::ScrollEvent::~ScrollEvent()
 {
   if (mDriver) {
     mDriver->RemoveRefreshObserver(this, Flush_Style);
     mDriver = nullptr;
   }
 }
 
 void
 ScrollFrameHelper::ScrollEvent::WillRefresh(mozilla::TimeStamp aTime)
 {
-  mDriver->RemoveRefreshObserver(this, Flush_Style);
+  mDriver->RemoveRefreshObserver(this, Flush_Layout);
   mDriver = nullptr;
   mHelper->FireScrollEvent();
 }
 
 void
 ScrollFrameHelper::FireScrollEvent()
 {
   MOZ_ASSERT(mScrollEvent);