Index: /trunk/src/VBox/Devices/Network/slirp/ip_icmp.c
===================================================================
--- /trunk/src/VBox/Devices/Network/slirp/ip_icmp.c	(revision 53302)
+++ /trunk/src/VBox/Devices/Network/slirp/ip_icmp.c	(revision 53303)
@@ -412,5 +412,7 @@
                 || CTL_CHECK(dst, CTL_TFTP))
             {
-                icp->icmp_type = ICMP_ECHOREPLY;
+                uint8_t echo_reply = ICMP_ECHOREPLY;
+                m_copyback(pData, m, hlen + RT_OFFSETOF(struct icmp, icmp_type),
+                           sizeof(echo_reply), (caddr_t)&echo_reply);
                 ip->ip_dst.s_addr = ip->ip_src.s_addr;
                 ip->ip_src.s_addr = dst;