diff --git a/app/Models/User.php b/app/Models/User.php
index 498e7c22a4..ce4893bf77 100644
--- a/app/Models/User.php
+++ b/app/Models/User.php
@@ -918,7 +918,7 @@ public function sendSystemNotification(string $subject, string $message): void
 
         PrivateMessage::create([
             'conversation_id' => $conversation->id,
-            'sender_id'       => $this->id,
+            'sender_id'       => self::SYSTEM_USER_ID,
             'message'         => $message
         ]);
     }
@@ -931,7 +931,7 @@ public static function sendSystemNotificationTo(int $userId, string $subject, st
 
         PrivateMessage::create([
             'conversation_id' => $conversation->id,
-            'sender_id'       => $userId,
+            'sender_id'       => self::SYSTEM_USER_ID,
             'message'         => $message
         ]);
     }