diff --git a/tox.ini b/tox.ini
index 33e5fa02c..e9c1dfa96 100644
--- a/tox.ini
+++ b/tox.ini
@@ -64,8 +64,9 @@ deps =
     mock
     nose
     hypothesis>=3.5.2
+changedir=testing
 commands =
-    pytest -n1 -rfsxX {posargs:testing}
+    pytest -n1 -rfsxX {posargs:.}
 
 [testenv:py36-xdist]
 deps = {[testenv:py27-xdist]deps}
@@ -91,10 +92,11 @@ deps =
     pytest-xdist>=1.13
     hypothesis>=3.5.2
 distribute = true
+changedir=testing
 setenv =
     PYTHONDONTWRITEBYTECODE=1
 commands =
-    pytest -n3 -rfsxX {posargs:testing}
+    pytest -n3 -rfsxX {posargs:.}
 
 [testenv:py27-trial]
 deps = twisted