diff --git a/pre_commit_hooks/requirements_txt_fixer.py b/pre_commit_hooks/requirements_txt_fixer.py
index 351e5b1..63f891f 100644
--- a/pre_commit_hooks/requirements_txt_fixer.py
+++ b/pre_commit_hooks/requirements_txt_fixer.py
@@ -150,4 +150,4 @@
 
 
 if __name__ == '__main__':
-    exit(main())
+    raise SystemExit(main())