diff --git a/tox.ini b/tox.ini
index 5a677e76fd79f1e87369b59ee2b24ed6cfe5783d..e97f8ab022c69cf7ff7aa65d782dddafbecfc90f 100644
--- a/tox.ini
+++ b/tox.ini
@@ -26,6 +26,9 @@ whitelist_externals = make
 commands = make coverage
 
 [testenv]
+whitelist_externals = xvfb-run
+    sh
+    pip
 setenv =
     PYTHONPATH = {toxinidir}
 deps =