diff --git a/dom/bindings/BindingUtils.cpp b/dom/bindings/BindingUtils.cpp
index df77c5cd37d6..d42a4a54f500 100644
--- a/dom/bindings/BindingUtils.cpp
+++ b/dom/bindings/BindingUtils.cpp
@@ -1252,7 +1252,7 @@ ResolvePrototypeOrConstructor(JSContext* cx, JS::Handle<JSObject*> wrapper,
                               JS::Handle<JSObject*> obj,
                               size_t protoAndIfaceCacheIndex, unsigned attrs,
                               JS::MutableHandle<JSPropertyDescriptor> desc,
-                              bool cacheOnHolder)
+                              bool& cacheOnHolder)
 {
   JS::Rooted<JSObject*> global(cx, js::GetGlobalForObjectCrossCompartment(obj));
   {