diff --git a/manifests/classes/postfix.pp b/manifests/classes/postfix.pp
index aa065ee51874bf3dcbcdeb7b3377451c9b3c16da..aa619688b68ad5459af621fe94425bb3e1c73890 100644
--- a/manifests/classes/postfix.pp
+++ b/manifests/classes/postfix.pp
@@ -89,7 +89,7 @@ class postfix {
     group => "root",
     mode => "0644",
     content => $operatingsystem ? {
-      /Redhat|CentOS/ => template("postfix/master.cf.redhat.erb", "postfix/master.cf.common.erb"),
+      /RedHat|CentOS/ => template("postfix/master.cf.redhat.erb", "postfix/master.cf.common.erb"),
       /Debian|Ubuntu|kFreeBSD/ => template("postfix/master.cf.debian.erb", "postfix/master.cf.common.erb"),
     },
     seltype => $postfix_seltype,