diff --git a/extras/pre-install.sh b/extras/pre-install.sh
index 3f7cf8cefe5476fe064d921bccdbca3ebe5b0551..8ef26d587034fe4875f4bab637ff40407fa3a97c 100644
--- a/extras/pre-install.sh
+++ b/extras/pre-install.sh
@@ -39,6 +39,7 @@ apt-get install -y \
   python-webpy \
   python-webtest \
   python-nose \
+  python-werkzeug \
   apache2 \
   libapache2-mod-wsgi \
   python-setuptools \