diff --git a/sys/net/gnrc/sock/udp/gnrc_sock_udp.c b/sys/net/gnrc/sock/udp/gnrc_sock_udp.c
index b9d91dea9f..07efaec178 100644
--- a/sys/net/gnrc/sock/udp/gnrc_sock_udp.c
+++ b/sys/net/gnrc/sock/udp/gnrc_sock_udp.c
@@ -278,19 +278,20 @@ ssize_t sock_udp_recv_buf_aux(sock_udp_t *sock, void **data, void **buf_ctx,
     return res;
 }
 
-ssize_t sock_udp_send_aux(sock_udp_t *sock, const void *data, size_t len,
-                          const sock_udp_ep_t *remote, sock_udp_aux_tx_t *aux)
+ssize_t sock_udp_sendv_aux(sock_udp_t *sock,
+                           const iolist_t *snips,
+                           const sock_udp_ep_t *remote, sock_udp_aux_tx_t *aux)
 {
     (void)aux;
     int res;
-    gnrc_pktsnip_t *payload, *pkt;
+    gnrc_pktsnip_t *pkt, *payload = NULL;
     uint16_t src_port = 0, dst_port;
     sock_ip_ep_t local;
     sock_udp_ep_t remote_cpy;
     sock_ip_ep_t *rem;
+    uint8_t *payload_buf;
 
     assert((sock != NULL) || (remote != NULL));
-    assert((len == 0) || (data != NULL)); /* (len != 0) => (data != NULL) */
 
     if (remote != NULL) {
         if (remote->port == 0) {
@@ -362,11 +363,21 @@ ssize_t sock_udp_send_aux(sock_udp_t *sock, const void *data, size_t len,
     else if (local.family != rem->family) {
         return -EINVAL;
     }
-    /* generate payload and header snips */
-    payload = gnrc_pktbuf_add(NULL, (void *)data, len, GNRC_NETTYPE_UNDEF);
+
+    /* allocate snip for payload */
+    payload = gnrc_pktbuf_add(NULL, NULL, iolist_size(snips), GNRC_NETTYPE_UNDEF);
     if (payload == NULL) {
         return -ENOMEM;
     }
+
+    /* copy payload data into payload snip */
+    payload_buf = payload->data;
+    while (snips) {
+        memcpy(payload_buf, snips->iol_base, snips->iol_len);
+        payload_buf += snips->iol_len;
+        snips = snips->iol_next;
+    }
+
     pkt = gnrc_udp_hdr_build(payload, src_port, dst_port);
     if (pkt == NULL) {
         gnrc_pktbuf_release(payload);