diff --git a/Makefile b/Makefile
index 0f582f219..437050ed4 100644
--- a/Makefile
+++ b/Makefile
@@ -77,7 +77,7 @@ release-test:
 	-rm dist/*.egg
 	-rmdir dist
 	python3 -m pytest -qq
-	check-manifest
+	python3 -m check_manifest
 	python3 -m pyroma .
 	$(MAKE) readme
 
diff --git a/RELEASING.md b/RELEASING.md
index 5132631b4..a6049b685 100644
--- a/RELEASING.md
+++ b/RELEASING.md
@@ -66,7 +66,7 @@ Released as needed for security, installation or critical bug fixes.
 * [ ] Create [binary distributions](https://github.com/python-pillow/Pillow/blob/main/RELEASING.md#binary-distributions)
 * [ ] Check and upload all binaries and source distributions e.g.:
   ```bash
-  python3 -m twine --strict check dist/*
+  python3 -m twine check --strict dist/*
   python3 -m twine upload dist/Pillow-5.2.1*
   ```
 * [ ] Publish the [release on GitHub](https://github.com/python-pillow/Pillow/releases)