diff --git a/object/enforcer.go b/object/enforcer.go
index 02a6a43b..468668fc 100644
--- a/object/enforcer.go
+++ b/object/enforcer.go
@@ -246,7 +246,7 @@ func (enforcer *Enforcer) LoadModelCfg() error {
 		return nil
 	}
 
-	model, err := GetModel(enforcer.Model)
+	model, err := GetModelEx(enforcer.Model)
 	if err != nil {
 		return err
 	} else if model == nil {
diff --git a/object/model.go b/object/model.go
index 19b73c73..a2832fc6 100644
--- a/object/model.go
+++ b/object/model.go
@@ -84,6 +84,19 @@ func GetModel(id string) (*Model, error) {
 	return getModel(owner, name)
 }
 
+func GetModelEx(id string) (*Model, error) {
+	owner, name := util.GetOwnerAndNameFromId(id)
+	model, err := getModel(owner, name)
+	if err != nil {
+		return nil, err
+	}
+	if model != nil {
+		return model, nil
+	}
+
+	return getModel("built-in", name)
+}
+
 func UpdateModelWithCheck(id string, modelObj *Model) error {
 	// check model grammar
 	_, err := model.NewModelFromString(modelObj.ModelText)
diff --git a/object/permission.go b/object/permission.go
index d08a97ba..4d6bd78e 100644
--- a/object/permission.go
+++ b/object/permission.go
@@ -151,7 +151,7 @@ func UpdatePermission(id string, permission *Permission) (bool, error) {
 	}
 
 	if permission.ResourceType == "Application" {
-		model, err := GetModel(util.GetId(owner, permission.Model))
+		model, err := GetModelEx(util.GetId(owner, permission.Model))
 		if err != nil {
 			return false, err
 		} else if model == nil {