diff --git a/types/naver-whale/tsconfig.json b/types/naver-whale/tsconfig.json
index 7efc1e4818..1bb2f4466d 100644
--- a/types/naver-whale/tsconfig.json
+++ b/types/naver-whale/tsconfig.json
@@ -3,7 +3,7 @@
         "module": "commonjs",
         "lib": ["es6", "dom"],
         "noImplicitAny": false,
-        "noImplicitThis": false,
+        "noImplicitThis": true,
         "strictNullChecks": true,
         "strictFunctionTypes": true,
         "baseUrl": "../",