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-rw-r--r--winsup/cygwin/include/cygwin/socket.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/winsup/cygwin/include/cygwin/socket.h b/winsup/cygwin/include/cygwin/socket.h
index fdb842dc6..44b11b75a 100644
--- a/winsup/cygwin/include/cygwin/socket.h
+++ b/winsup/cygwin/include/cygwin/socket.h
@@ -198,6 +198,7 @@ struct OLD_msghdr
/* Setsockoptions(2) level. Thanks to BSD these must match IPPROTO_xxx */
#define SOL_IP 0
+#define SOL_IPV6 41
#define SOL_IPX 256
#define SOL_AX25 257
#define SOL_ATALK 258