diff --git a/storage/interfaces.idl b/storage/interfaces.idl
index 4967404225ee15..c45690352f92c7 100644
--- a/storage/interfaces.idl
+++ b/storage/interfaces.idl
@@ -1,11 +1,9 @@
-[SecureContext,
- NoInterfaceObject,
- Exposed=(Window,Worker)]
-interface NavigatorStorage {
+[SecureContext]
+interface mixin NavigatorStorage {
   readonly attribute StorageManager storage;
 };
-Navigator implements NavigatorStorage;
-WorkerNavigator implements NavigatorStorage;
+Navigator includes NavigatorStorage;
+WorkerNavigator includes NavigatorStorage;
 
 [SecureContext,
  Exposed=(Window,Worker)]