diff --git a/slirp/arp_table.c b/slirp/arp_table.c
index ecdb0ba..bcaeb44 100644
--- a/slirp/arp_table.c
+++ b/slirp/arp_table.c
@@ -37,12 +37,7 @@ void arp_table_add(Slirp *slirp, uint32_t ip_addr, uint8_t ethaddr[ETH_ALEN])
                 ethaddr[0], ethaddr[1], ethaddr[2],
                 ethaddr[3], ethaddr[4], ethaddr[5]));
 
-    /* Check 0.0.0.0/8 invalid source-only addresses */
-    if ((ip_addr & htonl(~(0xfU << 28))) == 0) {
-        return;
-    }
-
-    if (ip_addr == 0xffffffff || ip_addr == broadcast_addr) {
+    if (ip_addr == 0 || ip_addr == 0xffffffff || ip_addr == broadcast_addr) {
         /* Do not register broadcast addresses */
         return;
     }
@@ -73,9 +68,6 @@ bool arp_table_search(Slirp *slirp, uint32_t ip_addr,
     DEBUG_CALL("arp_table_search");
     DEBUG_ARG("ip = 0x%x", ip_addr);
 
-    /* Check 0.0.0.0/8 invalid source-only addresses */
-    assert((ip_addr & htonl(~(0xfU << 28))) != 0);
-
     /* If broadcast address */
     if (ip_addr == 0xffffffff || ip_addr == broadcast_addr) {
         /* return Ethernet broadcast address */
diff --git a/slirp/slirp.c b/slirp/slirp.c
index 3fb48a4..2f189e0 100644
--- a/slirp/slirp.c
+++ b/slirp/slirp.c
@@ -778,6 +778,11 @@ int if_encap(Slirp *slirp, struct mbuf *ifm)
         return 1;
     }
 
+    if (!iph->ip_dst.s_addr) {
+        /* 0.0.0.0 can not a a source address, something went wrong, avoid
+         * making it it worse */
+        return 1;
+    }
     if (!arp_table_search(slirp, iph->ip_dst.s_addr, ethaddr)) {
         uint8_t arp_req[ETH_HLEN + sizeof(struct arphdr)];
         struct ethhdr *reh = (struct ethhdr *)arp_req;