--- query.c
+++ query.c
@@ -239,8 +239,8 @@
 		 * MAXDOMAINLEN ...
 		 */
 		if ((*src & 0xc0) ||
-		    (src + *src + 1 > buffer_end(query->packet)) || 
-		    (src + *src + 1 > query_name + MAXDOMAINLEN))
+		    (src + *src + 2 > buffer_end(query->packet)) || 
+		    (src + *src + 2 > query_name + MAXDOMAINLEN))
 		{
 			return 0;
 		}