Index: /trunk/src/VBox/Devices/Network/slirp/slirp.c
===================================================================
--- /trunk/src/VBox/Devices/Network/slirp/slirp.c	(revision 23922)
+++ /trunk/src/VBox/Devices/Network/slirp/slirp.c	(revision 23923)
@@ -1702,7 +1702,7 @@
 #else
     if (flags & ETH_ENCAP_URG)
-        slirp_urg_output(pData->pvUser, m, mtod(m, char *), mlen);
+        slirp_urg_output(pData->pvUser, m, mtod(m, const uint8_t *), mlen);
     else
-        slirp_output(pData->pvUser, m, mtod(m, char *), mlen);
+        slirp_output(pData->pvUser, m, mtod(m, const uint8_t *), mlen);
 #endif
 done: