diff --git a/jenkins-unittests.sh b/jenkins-unittests.sh
index 104d51199..6b0c296cf 100755
--- a/jenkins-unittests.sh
+++ b/jenkins-unittests.sh
@@ -22,4 +22,8 @@ export PEP8SUFFIX="--output-file=violations.flake8.log || echo flake8 finished w
 
 rm .coverage* || echo "No coverage files to remove"
 
+tox --notest -e py27
+TOX_BIN=$WORKSPACE/.tox/py27/bin
+python synapse/python_dependencies.py | xargs -n1 $TOX_BIN/pip install
+
 tox -e py27