diff --git a/sys/include/net/sock/ip.h b/sys/include/net/sock/ip.h
index cb8b61121a..1e296c3444 100644
--- a/sys/include/net/sock/ip.h
+++ b/sys/include/net/sock/ip.h
@@ -333,6 +333,14 @@ typedef struct {
  * @brief   Auxiliary data provided when sending using an IP sock object
  */
 typedef struct {
+#if defined(MODULE_SOCK_AUX_LOCAL) || defined(DOXYGEN)
+    /**
+     * @brief   The local endpoint from which the datagram will be sent
+     *
+     * @see SOCK_AUX_SET_LOCAL
+     */
+    sock_ip_ep_t local;
+#endif /* MODULE_SOCK_AUX_ENDPOINT */
 #if defined(MODULE_SOCK_AUX_TIMESTAMP) || defined(DOXYGEN)
     /**
      * @brief   System time the packet was send