diff --git a/dom/bindings/ToJSValue.h b/dom/bindings/ToJSValue.h
index 23d0e144fbd..fdbf52f78d4 100644
--- a/dom/bindings/ToJSValue.h
+++ b/dom/bindings/ToJSValue.h
@@ -193,6 +193,16 @@ ToJSValue(JSContext* aCx,
   return ToJSValue(aCx, *aArgument.get(), aValue);
 }
 
+// Accept WebIDL dictionaries
+template <class T>
+typename EnableIf<IsBaseOf<DictionaryBase, T>::value, bool>::Type
+ToJSValue(JSContext* aCx,
+          const T& aArgument,
+          JS::MutableHandle<JS::Value> aValue)
+{
+  return aArgument.ToObject(aCx, aValue);
+}
+
 // Accept arrays of other things we accept
 template <typename T>
 bool