diff --git a/dom/events/Touch.cpp b/dom/events/Touch.cpp
index e25528dd1186..e9c205cc2279 100644
--- a/dom/events/Touch.cpp
+++ b/dom/events/Touch.cpp
@@ -180,7 +180,7 @@ void Touch::SetTouchTarget(EventTarget* aTarget) {
   mTarget = aTarget;
 }
 
-bool Touch::Equals(Touch* aTouch) {
+bool Touch::Equals(Touch* aTouch) const {
   return mRefPoint == aTouch->mRefPoint && mForce == aTouch->mForce &&
          mRotationAngle == aTouch->mRotationAngle &&
          mRadius.x == aTouch->mRadius.x && mRadius.y == aTouch->mRadius.y;
diff --git a/dom/events/Touch.h b/dom/events/Touch.h
index ef1d788b6f28..a03e7c1580b1 100644
--- a/dom/events/Touch.h
+++ b/dom/events/Touch.h
@@ -48,7 +48,7 @@ class Touch final : public nsISupports,
   // Note, this sets both mOriginalTarget and mTarget.
   void SetTouchTarget(EventTarget* aTarget);
 
-  bool Equals(Touch* aTouch);
+  bool Equals(Touch* aTouch) const;
 
   virtual JSObject* WrapObject(JSContext* aCx,
                                JS::Handle<JSObject*> aGivenProto) override;
diff --git a/layout/base/TouchManager.cpp b/layout/base/TouchManager.cpp
index d59f781b80eb..cc7bc341d53e 100644
--- a/layout/base/TouchManager.cpp
+++ b/layout/base/TouchManager.cpp
@@ -273,8 +273,8 @@ bool TouchManager::PreHandleEvent(WidgetEvent* aEvent, nsEventStatus* aStatus,
           touches.RemoveElementAt(i);
           continue;
         }
-        RefPtr<Touch> oldTouch = info.mTouch;
-        if (!touch->Equals(oldTouch)) {
+        const RefPtr<Touch> oldTouch = info.mTouch;
+        if (!oldTouch->Equals(touch)) {
           touch->mChanged = true;
           haveChanged = true;
         }