diff --git a/models/migrations/v16.go b/models/migrations/v16.go
index 025cfef98..e44d524a4 100644
--- a/models/migrations/v16.go
+++ b/models/migrations/v16.go
@@ -28,6 +28,9 @@ func updateRepositorySizes(x *xorm.Engine) (err error) {
 		ID   int64
 		Name string
 	}
+	if err = x.Sync2(new(Repository)); err != nil {
+		return fmt.Errorf("Sync2: %v", err)
+	}
 	return x.Where("id > 0").Iterate(new(Repository),
 		func(idx int, bean interface{}) error {
 			repo := bean.(*Repository)