diff --git a/index.d.ts b/index.d.ts
index b1c57b3..d48ccd6 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -29,7 +29,7 @@ interface DataSources {
 }
 
 declare module 'egg' {
-  interface IModel extends sequelize.Sequelize, PlainObject {}
+  interface IModel extends sequelize.Sequelize {}
 
   // extend app
   interface Application {