diff --git a/mongodb/mongodb.d.ts b/mongodb/mongodb.d.ts
index 01b31e538c..05f71d20ae 100644
--- a/mongodb/mongodb.d.ts
+++ b/mongodb/mongodb.d.ts
@@ -302,8 +302,12 @@ declare module "mongodb" {
     findOne(selector: Object, fields: any, skip: number, limit: number, callback?: (err: Error, result: any) => void): Cursor;
     findOne(selector: Object, fields: any, skip: number, limit: number, timeout: number, callback?: (err: Error, result: any) => void): Cursor;
 
+    createIndex(fieldOrSpec: any, callback: (err: Error, indexName: string) => void): void;
     createIndex(fieldOrSpec: any, options: IndexOptions, callback: (err: Error, indexName: string) => void): void;
+
+    ensureIndex(fieldOrSpec: any, callback: (err: Error, indexName: string) => void): void;
     ensureIndex(fieldOrSpec: any, options: IndexOptions, callback: (err: Error, indexName: string) => void): void;
+
     indexInformation(options: any, callback: Function): void;
     dropIndex(name: string, callback: Function): void;
     dropAllIndexes(callback: Function): void;