diff --git a/module/Client/config/module.config.php b/module/Client/config/module.config.php
index 1dc258e4..e14eae9f 100644
--- a/module/Client/config/module.config.php
+++ b/module/Client/config/module.config.php
@@ -43,7 +43,7 @@
                'route' => '/client[/][:action][/][:id]',
                'constraints' => array(
                   'action' => '[a-zA-Z][a-zA-Z0-9_-]*',
-                  'id' => '[a-zA-Z][a-zA-Z0-9\._-]*',
+                  'id' => '[a-zA-Z0-9][a-zA-Z0-9\._-]*',
                ),
                'defaults' => array(
                   'controller' => 'Client\Controller\Client',