diff --git a/types/classnames/bind.d.ts b/types/classnames/bind.d.ts
index 4af94d1835..9befbabd4c 100644
--- a/types/classnames/bind.d.ts
+++ b/types/classnames/bind.d.ts
@@ -1,3 +1,3 @@
-import * as cn from "./index";
+import classNames = require('./index');
 
-export function bind(styles: Record<string, string>): typeof cn;
+export function bind(styles: Record<string, string>): typeof classNames;
diff --git a/types/classnames/tsconfig.json b/types/classnames/tsconfig.json
index f9b03432fc..0e8475e613 100644
--- a/types/classnames/tsconfig.json
+++ b/types/classnames/tsconfig.json
@@ -6,7 +6,7 @@
         ],
         "noImplicitAny": true,
         "noImplicitThis": true,
-        "strictNullChecks": false,
+        "strictNullChecks": true,
         "strictFunctionTypes": true,
         "baseUrl": "../",
         "typeRoots": [