diff --git a/library/Icinga/Protocol/Ldap/LdapConnection.php b/library/Icinga/Protocol/Ldap/LdapConnection.php
index dd6c9b161..7919fed02 100644
--- a/library/Icinga/Protocol/Ldap/LdapConnection.php
+++ b/library/Icinga/Protocol/Ldap/LdapConnection.php
@@ -1192,7 +1192,7 @@ class LdapConnection implements Selectable, Inspectable
 
                 $hostname = implode(' ', $ldapUrls);
             } else {
-                $hostname = 'ldaps://' . $hostname;
+                $hostname = 'ldaps://' . $hostname . ':' . $this->port;
             }
         }