diff --git a/modules/openstack_project/templates/puppet.conf.erb b/modules/openstack_project/templates/puppet.conf.erb
index beb02cd0f4..7fe8ce85c1 100644
--- a/modules/openstack_project/templates/puppet.conf.erb
+++ b/modules/openstack_project/templates/puppet.conf.erb
@@ -4,7 +4,7 @@ vardir=/var/lib/puppet
 ssldir=/var/lib/puppet/ssl
 rundir=/var/run/puppet
 server=<%= @puppetmaster_server %>
-certname=<%= @certname %>
+certname=<%= @certname.downcase %>
 pluginsync=true