diff --git a/tools/pretty_tox.sh b/tools/pretty_tox.sh
new file mode 100755
index 0000000..0fc3605
--- /dev/null
+++ b/tools/pretty_tox.sh
@@ -0,0 +1,6 @@
+#! /bin/sh
+
+TESTRARGS=$1
+
+exec 3>&1
+status=$(exec 4>&1 >&3; ( python setup.py testr --slowest --testr-args="--subunit $TESTRARGS"; echo $? >&4 ) | subunit-trace -f) && exit $status
diff --git a/tox.ini b/tox.ini
index 0eb2a2b..379f0ad 100644
--- a/tox.ini
+++ b/tox.ini
@@ -14,10 +14,11 @@ deps = -r{toxinidir}/requirements.txt
        -r{toxinidir}/test-requirements.txt
 
 whitelist_externals = find
+                      sh
 
 commands =
   find . -type f -name "*.pyc" -delete
-  python setup.py testr --testr-args='{posargs}'
+  sh tools/pretty_tox.sh '{posargs}'
 passenv = http_proxy HTTP_PROXY https_proxy HTTPS_PROXY no_proxy NO_PROXY
 
 [testenv:flake8]