diff --git a/types/mongoose/index.d.ts b/types/mongoose/index.d.ts
index 83aaa33b2b..87ce57f05c 100644
--- a/types/mongoose/index.d.ts
+++ b/types/mongoose/index.d.ts
@@ -424,6 +424,7 @@ declare module "mongoose" {
        */
       autoIndex?: boolean;
     };
+    autoIndex?: boolean;
   }
 
   /** See the node-mongodb-native driver instance for options that it understands. */
diff --git a/types/mongoose/mongoose-tests.ts b/types/mongoose/mongoose-tests.ts
index f4fec31101..7d23e6be6b 100644
--- a/types/mongoose/mongoose-tests.ts
+++ b/types/mongoose/mongoose-tests.ts
@@ -27,7 +27,8 @@ const connection2: Promise<mongoose.Mongoose> = mongoose.connect(connectUri, {
   bufferCommands: false,
   useNewUrlParser: true,
   useFindAndModify: true,
-  useCreateIndex: true
+  useCreateIndex: true,
+  autoIndex: true
 });
 const connection3: null = mongoose.connect(connectUri, function (error) {
   error.stack;