diff --git a/setup.cfg b/setup.cfg
index bef9f7871..708951da4 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -65,6 +65,7 @@ formats = sdist.tgz,bdist_wheel
 mypy_path = src
 ignore_missing_imports = True
 no_implicit_optional = True
+show_error_codes = True
 strict_equality = True
 warn_redundant_casts = True
 warn_return_any = True