diff --git a/build.sh b/build.sh
index 523f15f58..1b088d623 100755
--- a/build.sh
+++ b/build.sh
@@ -4,5 +4,4 @@ if [ ! -d ".build" ]; then
 fi
 . .build/bin/activate
 pip install -U -r requirements.txt
-python setup.py sdist
-tox $@
+python -m tox $@