$OpenBSD$

index 120e81e..ff864b1 100644
--- js/public/Class.h.orig	Fri Feb 20 15:40:37 2015
+++ js/public/Class.h	Fri Feb 20 15:40:37 2015
@@ -468,8 +468,12 @@ struct Class
         return flags & JSCLASS_EMULATES_UNDEFINED;
     }
 
+    bool isJSFunction() const {
+        return this == js::FunctionClassPtr;
+    }
+
     bool isCallable() const {
-        return this == js::FunctionClassPtr || call;
+        return isJSFunction() || call;
     }
 
     bool isProxy() const {