diff --git a/tox.ini b/tox.ini
index a9bfc81..593f2ad 100644
--- a/tox.ini
+++ b/tox.ini
@@ -96,10 +96,11 @@ basepython = python2.7
 deps = nose
        ipaddr
        simplegeneric
-changedir = {envdir}/build/wsme
-commands = pip install --build {envdir}/build --pre --no-clean --no-use-wheel wsme
-            {envdir}/bin/python setup.py develop
+changedir = {envdir}/src
+commands = pip install --download {envdir}/src --pre --no-deps --no-clean --no-use-wheel wsme
+            sh -c "find -iname 'wsme*.tar.gz' | xargs tar --strip-components 1 -xf"
             {envdir}/bin/pip install -U {toxinidir}  # install pecan-dev
+            {envdir}/bin/pip install .
             nosetests -v tests/pecantest
 
 [testenv:wsme-tip]