diff --git a/manifests/hitch/ssl_cert.pp b/manifests/hitch/ssl_cert.pp
index d498894..0f33404 100644
--- a/manifests/hitch/ssl_cert.pp
+++ b/manifests/hitch/ssl_cert.pp
@@ -1,16 +1,16 @@
 # Configure hitch to support a given TLS cert
-class profile::hitch::ssl_cert (
-  $ssl_cert_name = $title,
+define profile::hitch::ssl_cert (
+  String $ssl_cert_name = $title,
 ){
   include ::profile::ssl
 
   $ssl_cert = $::profile::ssl::certificate_paths[$ssl_cert_name]
   $ssl_ca   = $::profile::ssl::ca_paths[$ssl_cert_name]
   $ssl_key  = $::profile::ssl::private_key_paths[$ssl_cert_name]
 
   ::hitch::domain {$ssl_cert_name:
     key_source    => $ssl_key,
     cert_source   => $ssl_cert,
     cacert_source => $ssl_ca,
   }
 }