--- a/dom/animation/EffectCompositor.cpp
+++ b/dom/animation/EffectCompositor.cpp
@@ -1008,19 +1008,18 @@ EffectCompositor::PreTraverseInSubtree(S
     // document restyle (at the end of this function) but for consistency with
     // how we treat such elements in RequestRestyle, we just ignore them here.
     if (!nsComputedDOMStyle::GetPresShellForContent(target.mElement)) {
       return returnTarget;
     }
 
     // Ignore restyles that aren't in the flattened tree subtree rooted at
     // aRoot.
-    if (aRoot &&
-        !nsContentUtils::ContentIsFlattenedTreeDescendantOf(target.mElement,
-                                                            aRoot)) {
+    if (aRoot && !nsContentUtils::ContentIsFlattenedTreeDescendantOfForStyle(
+          target.mElement, aRoot)) {
       return returnTarget;
     }
 
     returnTarget = target;
     return returnTarget;
   };
 
   bool foundElementsNeedingRestyle = false;