--- a/dom/bindings/ToJSValue.h
+++ b/dom/bindings/ToJSValue.h
@@ -133,21 +133,20 @@ ToJSValue(JSContext* aCx,
   // Make sure we're called in a compartment
   MOZ_ASSERT(JS::CurrentGlobalOrNull(aCx));
 
   aValue.setObject(*aArgument.Callback());
 
   return MaybeWrapValue(aCx, aValue);
 }
 
-// Accept objects that inherit from nsWrapperCache and nsISupports (e.g. most
+// Accept objects that inherit from nsWrapperCache (e.g. most
 // DOM objects).
 template <class T>
-typename EnableIf<IsBaseOf<nsWrapperCache, T>::value &&
-                  IsBaseOf<nsISupports, T>::value, bool>::Type
+typename EnableIf<IsBaseOf<nsWrapperCache, T>::value, bool>::Type
 ToJSValue(JSContext* aCx,
           T& aArgument,
           JS::MutableHandle<JS::Value> aValue)
 {
   // Make sure we're called in a compartment
   MOZ_ASSERT(JS::CurrentGlobalOrNull(aCx));
   // Make sure non-webidl objects don't sneak in here
   MOZ_ASSERT(aArgument.IsDOMBinding());