diff --git a/tox.ini b/tox.ini
index 481038f..3a0e16d 100644
--- a/tox.ini
+++ b/tox.ini
@@ -6,7 +6,8 @@ commands =
     {envpython} -V
     {envpython} -m compileall speedtest.py
     {envpython} speedtest.py
-    {envpython} speedtest.py --source 172.17.0.1 || true
+    {envpython} speedtest.py --source 172.17.0.1
+    {envpython} speedtest.py --source 127.0.0.1 || true
 
 [testenv:flake8]
 basepython=python
@@ -20,3 +21,5 @@ commands =
     pypy -V
     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