diff --git a/types/mirrorx/index.d.ts b/types/mirrorx/index.d.ts
index 1ffcd20925..9cea8531dc 100644
--- a/types/mirrorx/index.d.ts
+++ b/types/mirrorx/index.d.ts
@@ -124,7 +124,7 @@ declare namespace mirror {
   interface defaultOptions {
     initialState?:{},
     historyMode?:string,
-    middlewares:[any],
+    middlewares:any[],
     reducers:{},
     addEffect(name:string,handler:()=>any):any
   }
diff --git a/types/mirrorx/tsconfig.json b/types/mirrorx/tsconfig.json
index c6dab55976..561f5cdab4 100644
--- a/types/mirrorx/tsconfig.json
+++ b/types/mirrorx/tsconfig.json
@@ -11,7 +11,7 @@
         ],
         "noImplicitAny": true,
         "noImplicitThis": true,
-        "strictNullChecks": false,
+        "strictNullChecks": true,
         "strictFunctionTypes": true,
         "baseUrl": "../",
         "jsx": "react",