diff --git a/models/migrations/v1_26/v324.go b/models/migrations/v1_26/v324.go
index 4dfd3040b6..5c67ed5998 100644
--- a/models/migrations/v1_26/v324.go
+++ b/models/migrations/v1_26/v324.go
@@ -9,6 +9,7 @@ func AddGroupColumnsToRepositoryTable(x *xorm.Engine) error {
 	type Repository struct {
 		LowerName      string `xorm:"UNIQUE(s) UNIQUE(g) INDEX NOT NULL"`
 		GroupID        int64  `xorm:"UNIQUE(g) INDEX DEFAULT 0"`
+		OwnerID        int64  `xorm:"UNIQUE(s) UNIQUE(g) index"`
 		GroupSortOrder int
 	}
 	_, err := x.SyncWithOptions(xorm.SyncOptions{
diff --git a/models/repo/repo.go b/models/repo/repo.go
index e1dd93cbaa..bfc64cb2a8 100644
--- a/models/repo/repo.go
+++ b/models/repo/repo.go
@@ -153,7 +153,7 @@ const (
 // Repository represents a git repository.
 type Repository struct {
 	ID                  int64 `xorm:"pk autoincr"`
-	OwnerID             int64 `xorm:"UNIQUE(s) index"`
+	OwnerID             int64 `xorm:"UNIQUE(s) UNIQUE(g) index"`
 	OwnerName           string
 	Owner               *user_model.User   `xorm:"-"`
 	LowerName           string             `xorm:"UNIQUE(s) UNIQUE(g) INDEX NOT NULL"`