diff --git a/manifests/init.pp b/manifests/init.pp
index c525619f..bf5c05aa 100755
--- a/manifests/init.pp
+++ b/manifests/init.pp
@@ -441,7 +441,7 @@
   Array $daemon_environment_files                           = [],
   Variant[String,Hash,Undef] $repo_opt                      = $docker::params::repo_opt,
   Boolean $nowarn_kernel                                    = $docker::params::nowarn_kernel,
-  Optional[String] $os                                      = $docker::params::os,
+  Optional[String] $os_lc                                   = $docker::params::os_lc,
   Optional[String] $storage_devs                            = $docker::params::storage_devs,
   Optional[String] $storage_vg                              = $docker::params::storage_vg,
   Optional[String] $storage_root_size                       = $docker::params::storage_root_size,
diff --git a/manifests/params.pp b/manifests/params.pp
index 223ad102..5a2c2806 100755
--- a/manifests/params.pp
+++ b/manifests/params.pp
@@ -85,7 +85,7 @@
   $registry_mirror                   = undef
   $compose_version                   = '1.9.0'
   $compose_install_path              = '/usr/local/bin'
-  $os                                = downcase($::operatingsystem)
+  $os_lc                             = downcase($::operatingsystem)
 
   case $::osfamily {
     'Debian' : {
@@ -142,8 +142,8 @@
       $service_config = undef
       $storage_setup_file = undef
 
-      $package_ce_source_location = "https://download.docker.com/linux/${os}"
-      $package_ce_key_source = "https://download.docker.com/linux/${os}/gpg"
+      $package_ce_source_location = "https://download.docker.com/linux/${os_lc}"
+      $package_ce_key_source = "https://download.docker.com/linux/${os_lc}/gpg"
       $package_ce_key_id = '9DC858229FC7DD38854AE2D88D81803C0EBFCD88'
       $package_ce_release = $::lsbdistcodename
       $package_source_location = 'http://apt.dockerproject.org/repo'