diff --git a/deployment_scripts/puppet/manifests/horizon-enable-lbaas.pp b/deployment_scripts/puppet/manifests/horizon-enable-lbaas.pp
index 0d4cf02..9438636 100644
--- a/deployment_scripts/puppet/manifests/horizon-enable-lbaas.pp
+++ b/deployment_scripts/puppet/manifests/horizon-enable-lbaas.pp
@@ -7,8 +7,8 @@ if $use_neutron {
   $apache_service        ='apache2'
 
   exec { 'enable_lbaas':
-    command  => "sed -ri \"s/^(\\s*)'enable_lb':.*/\\1'enable_lb': True,/g\" $horizon_settings_file",
-    unless   => "egrep \"^\\s*'enable_lb':\\s*True\" $horizon_settings_file",
+    command  => "sed -ri \"s/^(\\s*)'enable_lb':.*/\\1'enable_lb': True,/g\" ${horizon_settings_file}",
+    unless   => "egrep \"^\\s*'enable_lb':\\s*True\" ${horizon_settings_file}",
     path     => '/bin:/usr/bin',
     provider => 'shell',
   }