diff --git a/src/core/netif.c b/src/core/netif.c
index c3245de6..87693a61 100644
--- a/src/core/netif.c
+++ b/src/core/netif.c
@@ -306,7 +306,7 @@ void netif_set_up(struct netif *netif)
      *  to spontaneously cause other nodes to update an entry in their
      *  ARP cache. From RFC 3220 "IP Mobility Support for IPv4" section 4.6.
      */ 
-    if ((netif->flags & NETIF_FLAG_ETHARP) == 0) {
+    if (netif->flags & NETIF_FLAG_ETHARP) {
       etharp_query(netif, &(netif->ip_addr), NULL);
     }
 #endif /* LWIP_ARP */