diff --git a/types/mongodb/index.d.ts b/types/mongodb/index.d.ts
index ebe427a427..18e627ebfc 100644
--- a/types/mongodb/index.d.ts
+++ b/types/mongodb/index.d.ts
@@ -994,7 +994,7 @@ export interface WriteOpResult {
 //http://mongodb.github.io/node-mongodb-native/2.1/api/Cursor.html#~resultCallback
 export type CursorResult = any | void | boolean;
 
-type Default = { [key: string]: any };
+type Default = any;
 
 //http://mongodb.github.io/node-mongodb-native/2.1/api/Cursor.html
 export class Cursor<T = Default> extends Readable {
diff --git a/types/mongodb/mongodb-tests.ts b/types/mongodb/mongodb-tests.ts
index e4c7f3bd8a..549537812d 100644
--- a/types/mongodb/mongodb-tests.ts
+++ b/types/mongodb/mongodb-tests.ts
@@ -85,7 +85,7 @@ let options = {
     let cursor: mongodb.Cursor<bag> = collection.find<bag>({color: 'black'})
         cursor.toArray(function (err,r) { r[0].cost} );
         cursor.forEach(function (bag  ) { bag.color }, () => {});
-        collection.findOne({ color: 'white' }).then(() => { })
+        collection.findOne({ color: 'white' }).then(b => { let _b:bag = b; })
         collection.findOne<bag>({ color: 'white' }).then(b => { b.cost; })
     }
     {