diff --git a/js/src/jsfun.cpp b/js/src/jsfun.cpp
index 5255aebbfc..ec13ce3e9a 100644
--- a/js/src/jsfun.cpp
+++ b/js/src/jsfun.cpp
@@ -2424,11 +2424,7 @@ namespace detail {
 JS_PUBLIC_API(void)
 CheckIsValidConstructible(const Value& calleev)
 {
-    JSObject* callee = &calleev.toObject();
-    if (callee->is<JSFunction>())
-        MOZ_ASSERT(callee->as<JSFunction>().isConstructor());
-    else
-        MOZ_ASSERT(callee->constructHook() != nullptr);
+    MOZ_ASSERT(calleev.toObject().isConstructor());
 }
 
 } // namespace detail