diff --git a/manifests/package.pp b/manifests/package.pp
index 83ceae1..2751f18 100644
--- a/manifests/package.pp
+++ b/manifests/package.pp
@@ -17,7 +17,7 @@ class nginx::package {
   anchor { 'nginx::package::begin': }
   anchor { 'nginx::package::end': }
 
-  case $operatingsystem {
+  case $::operatingsystem {
     centos,fedora,rhel: {
       class { 'nginx::package::redhat':
         require => Anchor['nginx::package::begin'],
diff --git a/manifests/params.pp b/manifests/params.pp
index 7172b8a..5ea00c1 100644
--- a/manifests/params.pp
+++ b/manifests/params.pp
@@ -41,15 +41,15 @@ class nginx::params {
   $nx_proxy_read_timeout      = '90'
   $nx_proxy_buffers           = '32 4k'
 
-  $nx_logdir = $kernel ? {
+  $nx_logdir = $::kernel ? {
     /(?i-mx:linux)/ => '/var/log/nginx',
   }
 
-  $nx_pid = $kernel ? {
+  $nx_pid = $::kernel ? {
     /(?i-mx:linux)/  => '/var/run/nginx.pid',
   }
 
-  $nx_daemon_user = $operatingsystem ? {
+  $nx_daemon_user = $::operatingsystem ? {
     /(?i-mx:debian|ubuntu)/                    => 'www-data',
     /(?i-mx:fedora|rhel|centos|suse|opensuse)/ => 'nginx',
   }