diff --git a/typecheck.sh b/typecheck.sh
index 7797918..54117aa 100755
--- a/typecheck.sh
+++ b/typecheck.sh
@@ -1,2 +1,2 @@
 #!/bin/bash
-git ls-files \*.py | sort -u | xargs mypy --pretty --install-types --ignore-missing-imports "$@"
+git ls-files \*.py | sort -u | xargs mypy --pretty --show-error-codes --install-types --ignore-missing-imports "$@"