diff --git a/launch_slave.py b/launch_slave.py
index dcfdcaa1..ca238348 100644
--- a/launch_slave.py
+++ b/launch_slave.py
@@ -28,7 +28,7 @@ apt-get install -y --force-yes git rubygems
 gem install --no-rdoc --no-ri puppet
 git clone git://github.com/openstack/openstack-ci-puppet.git
 cd openstack-ci-puppet
-/var/lib/gems/1.8/bin/puppet apply --modulepath=`pwd`/modules manifests/%s.pp
+/var/lib/gems/1.8/bin/puppet apply -l /tmp/manifest.log --modulepath=`pwd`/modules manifests/%s.pp
 """ % node_manifest)
 
 # a task that first installs the ssh key, and then runs the script