diff --git a/src/alert/alert.service.ts b/src/alert/alert.service.ts
index 02cfcb8..4cb5ab4 100644
--- a/src/alert/alert.service.ts
+++ b/src/alert/alert.service.ts
@@ -85,11 +85,12 @@ export async function markAsRead(alertId: string, user: AuthenticatedUser) {
 
   if (!updatedAlert) return null;
 
-  updatedAlert["read"] = updatedAlert.readBy.includes(user.userId)
-    ? true
-    : false;
+  const modifiedAlert = {
+    ...updatedAlert.toObject(),
+    read: updatedAlert.readBy.includes(user.userId) ? true : false,
+  };
 
-  return updatedAlert;
+  return modifiedAlert;
 }
 
 export async function getUnreadCount(user: AuthenticatedUser) {