diff --git a/slirp/if.c b/slirp/if.c
index 47bebe4925d05b510c425a4b26e751b95efc6f79..2852396a4a50ff14e80290f852a7b1389c430f2f 100644
--- a/slirp/if.c
+++ b/slirp/if.c
@@ -106,9 +106,6 @@ if_output(struct socket *so, struct mbuf *ifm)
 	ifs_init(ifm);
 	insque(ifm, ifq);
 
-        /* Expiration date = Now + 1 second */
-        ifm->expiration_date = qemu_get_clock_ns(rt_clock) + 1000000000ULL;
-
 diddit:
 	slirp->if_queued++;
 
diff --git a/slirp/slirp.c b/slirp/slirp.c
index a86cc6eb2db3b8c8ca9fcf889582396d8741fa43..2c242ef4ebcbc89320b9134830fe60fb6d672227 100644
--- a/slirp/slirp.c
+++ b/slirp/slirp.c
@@ -738,6 +738,9 @@ int if_encap(Slirp *slirp, struct mbuf *ifm)
             slirp->client_ipaddr = iph->ip_dst;
             slirp_output(slirp->opaque, arp_req, sizeof(arp_req));
             ifm->arp_requested = true;
+
+            /* Expire request and drop outgoing packet after 1 second */
+            ifm->expiration_date = qemu_get_clock_ns(rt_clock) + 1000000000ULL;
         }
         return 0;
     } else {