diff --git a/tox.ini b/tox.ini
index ad43d9ec..e6470146 100644
--- a/tox.ini
+++ b/tox.ini
@@ -7,6 +7,7 @@ commands =
     py.test \
         --basetemp={envtmpdir} \
         --junit-xml=xunit-{envname}.xml --cov=mopidy \
+        -n 4 \
         {posargs}
 deps =
     mock