diff --git a/ptop.sh b/ptop.sh
index fb2be5e..8407ba3 100755
--- a/ptop.sh
+++ b/ptop.sh
@@ -2,4 +2,4 @@
 
 # Run ptop from current sources
 
-tox -e package > /dev/null && ./px.pex --top "$@"
+PYTHONPATH=px:$(echo env/lib/python*/site-packages) python3 -m px.px --top "$@"
diff --git a/px.sh b/px.sh
index 65a762e..9d80fd1 100755
--- a/px.sh
+++ b/px.sh
@@ -2,4 +2,4 @@
 
 # Run px from current sources
 
-tox -e package > /dev/null && ./px.pex "$@"
+PYTHONPATH=px:$(echo env/lib/python*/site-packages) python3 -m px.px "$@"