--- a/layout/style/ServoBindings.cpp
+++ b/layout/style/ServoBindings.cpp
@@ -659,16 +659,18 @@ Gecko_UpdateAnimations(RawGeckoElementBo
     return;
   }
 
   nsPresContext* presContext = nsContentUtils::GetContextForContent(aElement);
   if (!presContext || !presContext->IsDynamic()) {
     return;
   }
 
+  nsAutoAnimationMutationBatch mb(aElement->OwnerDoc());
+
   CSSPseudoElementType pseudoType =
     GetPseudoTypeFromElementForAnimation(aElement);
 
   if (aTasks & UpdateAnimationsTasks::CSSAnimations) {
     presContext->AnimationManager()->
       UpdateAnimations(const_cast<dom::Element*>(aElement), pseudoType,
                        aComputedData);
   }