diff --git a/dlls/ws2_32/socket.c b/dlls/ws2_32/socket.c
index d7e5276da3c..b06d7e748b3 100644
--- a/dlls/ws2_32/socket.c
+++ b/dlls/ws2_32/socket.c
@@ -687,6 +687,7 @@ static const int ws_proto_map[][2] =
     MAP_OPTION( IPPROTO_IP ),
     MAP_OPTION( IPPROTO_TCP ),
     MAP_OPTION( IPPROTO_UDP ),
+    MAP_OPTION( IPPROTO_IPV6 ),
     MAP_OPTION( IPPROTO_ICMP ),
     MAP_OPTION( IPPROTO_IGMP ),
     MAP_OPTION( IPPROTO_RAW ),