diff --git a/types/mongodb/index.d.ts b/types/mongodb/index.d.ts
index d1c47eff64..98aa2daca8 100644
--- a/types/mongodb/index.d.ts
+++ b/types/mongodb/index.d.ts
@@ -48,7 +48,7 @@ export class MongoClient extends EventEmitter {
     /** http://mongodb.github.io/node-mongodb-native/3.0/api/MongoClient.html#db */
     db(dbName?: string, options?: MongoClientCommonOption): Db
     /** http://mongodb.github.io/node-mongodb-native/3.0/api/MongoClient.html#isConnected */
-    isConnected(name: string, options?: MongoClientCommonOption): boolean;
+    isConnected(options?: MongoClientCommonOption): boolean;
     /** http://mongodb.github.io/node-mongodb-native/3.0/api/MongoClient.html#logout */
     logout(callback: MongoCallback<any>): void;
     logout(options?: { dbName?: string }): Promise<any>;