diff --git a/js/src/vm/Shape.h b/js/src/vm/Shape.h
index 978798aaa6..fd6d843e02 100644
--- a/js/src/vm/Shape.h
+++ b/js/src/vm/Shape.h
@@ -905,9 +905,6 @@ class Shape : public gc::TenuredCell
                setter() == rawSetter;
     }
 
-    bool set(JSContext* cx, HandleNativeObject obj, HandleObject receiver, MutableHandleValue vp,
-             ObjectOpResult& result);
-
     BaseShape* base() const { return base_.get(); }
 
     bool hasSlot() const {