diff --git a/lib/dl_connector_mysql/dl_connector_mysql/core/storage_schemas/connection.py b/lib/dl_connector_mysql/dl_connector_mysql/core/storage_schemas/connection.py
index 2b4f69230..3cd8d3a3b 100644
--- a/lib/dl_connector_mysql/dl_connector_mysql/core/storage_schemas/connection.py
+++ b/lib/dl_connector_mysql/dl_connector_mysql/core/storage_schemas/connection.py
@@ -1,3 +1,5 @@
+from marshmallow import fields as ma_fields
+
 from dl_core.us_manager.storage_schemas.connection import ConnectionSQLDataStorageSchema
 
 from dl_connector_mysql.core.us_connection import ConnectionMySQL