--- a/layout/painting/nsDisplayList.h
+++ b/layout/painting/nsDisplayList.h
@@ -4105,17 +4105,17 @@ public:
   virtual already_AddRefed<Layer> BuildLayer(nsDisplayListBuilder* aBuilder,
                                              LayerManager* aManager,
                                              const ContainerLayerParameters& aContainerParameters) override;
   NS_DISPLAY_DECL_NAME("FixedPosition", TYPE_FIXED_POSITION)
   virtual LayerState GetLayerState(nsDisplayListBuilder* aBuilder,
                                    LayerManager* aManager,
                                    const ContainerLayerParameters& aParameters) override
   {
-    return mozilla::LAYER_ACTIVE;
+    return mozilla::LAYER_ACTIVE_FORCE;
   }
   virtual bool TryMerge(nsDisplayItem* aItem) override;
 
   virtual bool ShouldFixToViewport(nsDisplayListBuilder* aBuilder) override { return mIsFixedBackground; }
 
   virtual uint32_t GetPerFrameKey() override { return (mIndex << nsDisplayItem::TYPE_BITS) | nsDisplayItem::GetPerFrameKey(); }
 
   AnimatedGeometryRoot* AnimatedGeometryRootForScrollMetadata() const override {