diff --git a/sys/include/net/ng_netconf.h b/sys/include/net/ng_netconf.h
index 167b22119329ffbe16310bdcc6129d6dff552fd9..6d6439526ccc4137d20b497ff7f939de2cdb2fd8 100644
--- a/sys/include/net/ng_netconf.h
+++ b/sys/include/net/ng_netconf.h
@@ -120,6 +120,13 @@ typedef enum {
     NETCONF_OPT_AUTOCCA,            /**< en/disable to check automatically
                                          before sending the channel is clear. */
     /* add more options if needed */
+
+    /**
+     * @brief   maximum number of options defined here
+     *
+     * @note    Interfaces are not meant to respond to that.
+     */
+    NETCONF_OPT_NUMOF,
 } ng_netconf_opt_t;
 
 /**