diff --git a/Makefile b/Makefile
index 0eefdfb..e3503a6 100644
--- a/Makefile
+++ b/Makefile
@@ -12,6 +12,7 @@ run: venv
 	venv/bin/flask --app scipaperloader --debug run
 
 format: venv
+	rm -rf venv
 	venv/bin/black . && venv/bin/isort .
 
 format-check: venv