diff --git a/src/driver/mongodb/typings.ts b/src/driver/mongodb/typings.ts
index 319319a1d5..9ec1f61d6f 100644
--- a/src/driver/mongodb/typings.ts
+++ b/src/driver/mongodb/typings.ts
@@ -4271,7 +4271,7 @@ export interface BulkWriteResult {
     /**
      * Return an array of upserted ids.
      */
-    getUpsertedIds(): Array<Object>;
+    getUpsertedIds(): Array<{ _id: string, index: number }>;
 
     /**
      * Retrieve the write concern error if any.