diff --git a/tox.ini b/tox.ini
index 721d08dc..9a4f9f2d 100644
--- a/tox.ini
+++ b/tox.ini
@@ -3,6 +3,8 @@ envlist = flake8,
           py26twisted,
           py26asyncio,
           py27twisted,
+          py33twisted,
+          py34twisted,
           py27asyncio,
           py33asyncio,
           py34asyncio,
@@ -95,6 +97,22 @@ setenv =
    USE_TWISTED = 1
 
 
+[testenv:py34twisted]
+commands =
+   sh -c "which python"
+   sh -c "which trial"
+   sh -c "which coverage"
+   python -V
+   coverage --version
+   # XXX should probably add --branch
+   # note: always doing --append so we can get coverage across all
+   # Python versions at once; see "make test_coverage"
+   coverage run --append --source=autobahn --omit=*test* {envbindir}/py.test autobahn/wamp/test/test_protocol.py autobahn/wamp/test/test_message.py autobahn/wamp/test/test_auth.py autobahn/wamp/test/test_protocol_peer.py autobahn/wamp/test/test_serializer.py autobahn/wamp/test/test_uri_pattern.py autobahn/wamp/test/test_user_handler_errors.py autobahn/websocket/test/test_websocket.py
+basepython = python3.4
+install_command = pip install {packages} autobahn[twisted,serialization]
+setenv =
+   USE_TWISTED = 1
+
 
 [testenv:py27asyncio]
 commands =