diff --git a/src/core/udp.c b/src/core/udp.c
index 7550c64b..2d345437 100644
--- a/src/core/udp.c
+++ b/src/core/udp.c
@@ -649,8 +649,10 @@ udp_sendto_if_chksum(struct udp_pcb *pcb, struct pbuf *p, const ip_addr_t *dst_i
   else
 #endif /* LWIP_IPV4 && LWIP_IPV6 */
 #if LWIP_IPV4
-  if (ip4_addr_isany(ip_2_ip4(&pcb->local_ip))) {
-    /* use outgoing network interface IP address as source address */
+  if (ip4_addr_isany(ip_2_ip4(&pcb->local_ip)) ||
+      ip4_addr_ismulticast(ip_2_ip4(&pcb->local_ip))) {
+    /* if the local_ip is any or multicast
+     * use the outgoing network interface IP address as source address */
     src_ip = netif_ip_addr4(netif);
   } else {
     /* check if UDP PCB local IP address is correct