diff --git a/manifests/init.pp b/manifests/init.pp
index 8a5e9bd..d7fb271 100644
--- a/manifests/init.pp
+++ b/manifests/init.pp
@@ -9,7 +9,7 @@ class exim(
     ensure => present,
   }
 
-  if ($::operatingsystem == 'Redhat') {
+  if ($::osfamily == 'RedHat') {
     service { 'postfix':
       ensure      => stopped
     }
diff --git a/manifests/params.pp b/manifests/params.pp
index 13adb1d..a1212a4 100644
--- a/manifests/params.pp
+++ b/manifests/params.pp
@@ -4,7 +4,7 @@
 # accessed by other classes.
 class exim::params {
   case $::osfamily {
-    'Redhat': {
+    'RedHat': {
       $package = 'exim'
       $service_name = 'exim'
       $config_file = '/etc/exim/exim.conf'