diff --git a/app/common/model/MaintenanceCategory.php b/app/common/model/MaintenanceCategory.php
index 41f31c54..fab5b990 100644
--- a/app/common/model/MaintenanceCategory.php
+++ b/app/common/model/MaintenanceCategory.php
@@ -53,6 +53,6 @@ class MaintenanceCategory extends BaseModel
     }
 
     public function maintenances() {
-        return $this->hasMany(MaintenanceCategory::class);
+        return $this->hasMany(MaintenanceCategory::class,'category_id', 'id');
     }
 }