diff --git a/exasol_integration_test_docker_environment/lib/config/build_config.py b/exasol_integration_test_docker_environment/lib/config/build_config.py
index 52dd43f81..d1076f324 100644
--- a/exasol_integration_test_docker_environment/lib/config/build_config.py
+++ b/exasol_integration_test_docker_environment/lib/config/build_config.py
@@ -1,4 +1,5 @@
 import luigi
+from typing import List, Optional
 
 from exasol_integration_test_docker_environment.cli.options.system_options import DEFAULT_OUTPUT_DIRECTORY