diff --git a/setup.cfg b/setup.cfg
index 1d4a31c2..d86316a1 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -61,6 +61,7 @@ warn_unreachable = True
 strict_equality = True
 disallow_untyped_defs = True
 disallow_untyped_calls = True
+show_error_codes = True
 files =
   tuf/api/,
   tuf/ngclient,