diff --git a/tox.ini b/tox.ini
index b39d786c3..6e3f570fc 100644
--- a/tox.ini
+++ b/tox.ini
@@ -11,7 +11,7 @@ setenv =
   TESTS = test/
   HOME = {envtmpdir}
 commands =
-  py.test -n 4 --timeout 60 {posargs} {env:TESTS}
+  py.test --timeout 60 {posargs} {env:TESTS}
   {env:CI_COMMANDS:python -c ""}
 
 [testenv:py35]