diff --git a/types/mongodb/index.d.ts b/types/mongodb/index.d.ts
index 5c9f459b82..3184d28c3a 100644
--- a/types/mongodb/index.d.ts
+++ b/types/mongodb/index.d.ts
@@ -44,7 +44,7 @@ export function connect(uri: string, options?: MongoClientOptions): Promise<Mong
 export function connect(uri: string, callback: MongoCallback<MongoClient>): void;
 export function connect(uri: string, options: MongoClientOptions, callback: MongoCallback<MongoClient>): void;
 
-export { Binary, DBRef, Decimal128, Double, Long, MaxKey, MinKey, ObjectID, ObjectId, Timestamp } from 'bson';
+export { Binary, DBRef, Decimal128, Double, Int32, Long, MaxKey, MinKey, ObjectID, ObjectId, Timestamp } from 'bson';
 
 // Class documentation : http://mongodb.github.io/node-mongodb-native/3.1/api/MongoClient.html
 export class MongoClient extends EventEmitter {