diff --git a/types/mongodb/v2/index.d.ts b/types/mongodb/v2/index.d.ts
index 4c26149d81..a7d45ac2d0 100644
--- a/types/mongodb/v2/index.d.ts
+++ b/types/mongodb/v2/index.d.ts
@@ -22,7 +22,7 @@ export function connect(uri: string, options?: MongoClientOptions): Promise<Db>;
 export function connect(uri: string, callback: MongoCallback<Db>): void;
 export function connect(uri: string, options: MongoClientOptions, callback: MongoCallback<Db>): void;
 
-export { Binary, Double, Long, Decimal128, MaxKey, MinKey, ObjectID, ObjectId, Timestamp, DBRef } from 'bson';
+export { Binary, Double, Long, Decimal128, MaxKey, MinKey, ObjectID, ObjectId, Timestamp, DBRef, Int32 } from 'bson';
 
 // Class documentation : http://mongodb.github.io/node-mongodb-native/2.1/api/MongoClient.html
 export class MongoClient {