diff --git a/tox.ini b/tox.ini
index 3a0e16d..cd7a757 100644
--- a/tox.ini
+++ b/tox.ini
@@ -7,7 +7,7 @@ commands =
     {envpython} -m compileall speedtest.py
     {envpython} speedtest.py
     {envpython} speedtest.py --source 172.17.0.1
-    {envpython} speedtest.py --source 127.0.0.1 || true
+    bash -c \'{envpython} speedtest.py --source 127.0.0.1 || true\'
 
 [testenv:flake8]
 basepython=python
@@ -22,4 +22,4 @@ commands =
     pypy -m compileall speedtest.py
     pypy speedtest.py
     pypy speedtest.py --source 172.17.0.1
-    pypy speedtest.py --source 127.0.0.1 || true
+    bash -c \'pypy speedtest.py --source 127.0.0.1 || true\'