diff --git a/monkey/monkey_island/cc/repository/mongo_credentials_repository.py b/monkey/monkey_island/cc/repository/mongo_credentials_repository.py
index ee8beb13c..25789f937 100644
--- a/monkey/monkey_island/cc/repository/mongo_credentials_repository.py
+++ b/monkey/monkey_island/cc/repository/mongo_credentials_repository.py
@@ -7,6 +7,8 @@ from monkey_island.cc.repository import RemovalError, RetrievalError, StorageErr
 from monkey_island.cc.repository.i_credentials_repository import ICredentialsRepository
 from monkey_island.cc.server_utils.encryption import ILockableEncryptor
 
+from .consts import MONGO_OBJECT_ID_KEY
+
 
 class MongoCredentialsRepository(ICredentialsRepository):
     """
@@ -51,7 +53,7 @@ class MongoCredentialsRepository(ICredentialsRepository):
             collection_result = []
             list_collection_result = list(collection.find({}))
             for encrypted_credentials in list_collection_result:
-                del encrypted_credentials["_id"]
+                del encrypted_credentials[MONGO_OBJECT_ID_KEY]
                 plaintext_credentials = self._decrypt_credentials_mapping(encrypted_credentials)
                 collection_result.append(Credentials.from_mapping(plaintext_credentials))