--- a/layout/painting/nsDisplayList.h
+++ b/layout/painting/nsDisplayList.h
@@ -1550,17 +1550,17 @@ private:
   nsDisplayItem*                 mGlassDisplayItem;
   // A temporary list that we append scroll info items to while building
   // display items for the contents of frames with SVG effects.
   // Only non-null when ShouldBuildScrollInfoItemsForHoisting() is true.
   // This is a pointer and not a real nsDisplayList value because the
   // nsDisplayList class is defined below this class, so we can't use it here.
   nsDisplayList*                 mScrollInfoItemsForHoisting;
   nsTArray<ActiveScrolledRoot*>  mActiveScrolledRoots;
-  nsTArray<DisplayItemClipChain*> mClipChainsToDestroy;
+  AutoTArray<DisplayItemClipChain*, 128> mClipChainsToDestroy;
   nsTArray<nsDisplayItem*> mTemporaryItems;
   const ActiveScrolledRoot*      mActiveScrolledRootForRootScrollframe;
   nsDisplayListBuilderMode       mMode;
   ViewID                         mCurrentScrollParentId;
   ViewID                         mCurrentScrollbarTarget;
   uint32_t                       mCurrentScrollbarFlags;
   Preserves3DContext             mPreserves3DCtx;
   uint32_t                       mPerspectiveItemIndex;