--- a/dom/animation/Animation.cpp
+++ b/dom/animation/Animation.cpp
@@ -1199,17 +1199,17 @@ Animation::IsPossiblyOrphanedPendingAnim
 
 StickyTimeDuration
 Animation::EffectEnd() const
 {
   if (!mEffect) {
     return StickyTimeDuration(0);
   }
 
-  return mEffect->GetComputedTiming().mEndTime;
+  return mEffect->SpecifiedTiming().EndTime();
 }
 
 nsIDocument*
 Animation::GetRenderedDocument() const
 {
   if (!mEffect) {
     return nullptr;
   }