diff --git a/models/migrations/v20.go b/models/migrations/v20.go
index 982914a06e..ded99e09ce 100644
--- a/models/migrations/v20.go
+++ b/models/migrations/v20.go
@@ -34,6 +34,7 @@ func useNewNameAvatars(x *xorm.Engine) error {
 	}
 
 	type User struct {
+		ID              int64 `xorm:"pk autoincr"`
 		Avatar          string
 		UseCustomAvatar bool
 	}