diff --git a/lib/roken/socket.c b/lib/roken/socket.c
index 2b2f669ba..ebb9936e6 100644
--- a/lib/roken/socket.c
+++ b/lib/roken/socket.c
@@ -270,7 +270,8 @@ socket_set_tos (int sock, int tos)
 {
 #if defined(IP_TOS) && defined(HAVE_SETSOCKOPT)
     if (setsockopt (sock, IPPROTO_IP, IP_TOS, (void *) &tos, sizeof (int)) < 0)
-	warn ("setsockopt TOS (ignored)");
+	if (errno != EINVAL)
+	    warn ("setsockopt TOS (ignored)");
 #endif
 }