diff -r 78891f472fbf sys/src/cmd/vnc/auth.c
--- a/sys/src/cmd/vnc/auth.c	Sun Oct 18 23:39:07 2020 +0200
+++ b/sys/src/cmd/vnc/auth.c	Sun Oct 18 19:24:25 2020 -0700
@@ -77,7 +77,7 @@
 				type == ANoAuth ? "None" :
 				type == AVncAuth ? "VNC" : "Unknown");
 		}
-		if(type > auth)
+		if(type > auth && type <= AVncAuth)
 			auth = type;
 	}
 	return auth;