diff --git a/manifests/service.pp b/manifests/service.pp
index 6d78a00a3..66dfe02fa 100644
--- a/manifests/service.pp
+++ b/manifests/service.pp
@@ -17,6 +17,7 @@
   exec { 'rebuild-nginx-vhosts':
     command     => "/bin/cat ${nginx::params::nx_temp_dir}/nginx.d/* > ${nginx::params::nx_conf_dir}/conf.d/vhost_autogen.conf",
     refreshonly => true,
+    unless	=> "/usr/bin/test ! -f ${nginx::params::nx_temp_dir}/nginx.d/*",
     subscribe   => File["${nginx::params::nx_temp_dir}/nginx.d"],
   }
   service { "nginx":