diff --git a/module_build_service/builder/__init__.py b/module_build_service/builder/__init__.py
index 59a6d018..335fd992 100644
--- a/module_build_service/builder/__init__.py
+++ b/module_build_service/builder/__init__.py
@@ -2,7 +2,7 @@ import pkg_resources
 
 from module_build_service.builder.base import GenericBuilder
 
-__all__ = [GenericBuilder]
+__all__ = ["GenericBuilder"]
 
 for entrypoint in pkg_resources.iter_entry_points("mbs.builder_backends"):
     GenericBuilder.register_backend_class(entrypoint.load())