1 files changed, 4 insertions, 0 deletions
diff --git a/slirp/udp.c b/slirp/udp.c
index 2dd51a39fe..aefa0b749b 100644
--- a/slirp/udp.c
+++ b/slirp/udp.c
@@ -339,7 +339,11 @@ udp_attach(so)
       int lasterrno=errno;
       closesocket(so->s);
       so->s=-1;
+#ifdef _WIN32
+      WSASetLastError(lasterrno);
+#else
       errno=lasterrno;
+#endif
     } else {
       /* success, insert in queue */
       so->so_expire = curtime + SO_EXPIRE;