--- a/dom/animation/ScrollTimeline.h
+++ b/dom/animation/ScrollTimeline.h
@@ -50,16 +50,17 @@ public:
     , mElement(aTarget)
     , mCurrentScroll(0)
     , mMinScroll(0)
     , mMaxScroll(0)
   {
     mScrollObserver = new ScrollObserverImpl(this);
     aTarget->RegistScrollTimelineObserver(mScrollObserver);
     CalculateTimeRange();
+    SetScrollValues();
   }
 
 protected:
   virtual ~ScrollTimeline()
   {
     MOZ_ASSERT(!mIsObservingRefreshDriver, "Timeline should have disassociated"
                " from the refresh driver before being destroyed");
     if (mScrollObserver) {