diff --git a/sendmail/manifests/init.pp b/sendmail/manifests/init.pp
index 94d2558..68b6e28 100644
--- a/sendmail/manifests/init.pp
+++ b/sendmail/manifests/init.pp
@@ -6,7 +6,7 @@ class sendmail::common {
         $mail_domain = $domain
     }
 
-    if $operatingsystem != "openbsd" {
+    if $operatingsystem != "OpenBSD" {
         package { "sendmail":
             name   => [ "sendmail", "sendmail-cf", ],
             ensure => installed,