--- a/vagrant/allura_setup.sh
+++ b/vagrant/allura_setup.sh
@@ -21,7 +21,7 @@
MONGODB_VERSION=2.2.3
MONGODB_PKG_URL="deb http://downloads-distro.mongodb.org/repo/ubuntu-upstart dist 10gen"
MONGODB_SRC_LST=/etc/apt/sources.list.d/10gen.list
-if [ $(mongo --version 2>/dev/null | sed 's/.*: //') != $MONGODB_VERSION ]
+if [ "$(mongo --version 2>/dev/null | sed 's/.*: //')" != "$MONGODB_VERSION" ]
then
echo "Installing Mongodb $MONGODB_VERSION..."
sudo apt-get -y -q purge mongodb mongodb-clients mongodb-server mongodb-dev