diff --git a/src/core/udp.c b/src/core/udp.c
index 948848a3..fcc8e32d 100644
--- a/src/core/udp.c
+++ b/src/core/udp.c
@@ -66,7 +66,6 @@ struct udp_pcb *udp_pcbs = NULL;
 
 static struct udp_pcb *pcb_cache = NULL;
 
-
 void
 udp_init(void)
 {
@@ -410,6 +409,14 @@ udp_send(struct udp_pcb *pcb, struct pbuf *p)
       return err;
     }
   }
+  /* find the outgoing network interface for this packet */
+  netif = ip_route(&(pcb->remote_ip));
+  /* no outgoing network interface could be found? */
+  if (netif == NULL) {
+    LWIP_DEBUGF(UDP_DEBUG | 1, ("udp_send: No route to 0x%lx\n", pcb->remote_ip.addr));
+    UDP_STATS_INC(udp.rterr);
+    return ERR_RTE;
+  }
 
   /* not enough space to add an UDP header to first pbuf in given p chain? */
   if (pbuf_header(p, UDP_HLEN)) {
@@ -437,14 +444,6 @@ udp_send(struct udp_pcb *pcb, struct pbuf *p)
   /* in UDP, 0 checksum means 'no checksum' */
   udphdr->chksum = 0x0000; 
 
-  /* find the outgoing network interface for this packet */
-  netif = ip_route(&(pcb->remote_ip));
-  /* no outgoing network interface could be found? */
-  if (netif == NULL) {
-    LWIP_DEBUGF(UDP_DEBUG | 1, ("udp_send: No route to 0x%lx\n", pcb->remote_ip.addr));
-    UDP_STATS_INC(udp.rterr);
-    return ERR_RTE;
-  }
   /* PCB local address is IP_ANY_ADDR? */
   if (ip_addr_isany(&pcb->local_ip)) {
     /* use outgoing network interface IP address as source address */