--- glibc-old/resolv/res_comp.c	2010-06-12 18:57:43.000000000 +0800
+++ glibc/resolv/res_comp.c	2010-08-20 03:11:04.653580579 +0800
@@ -146,8 +146,8 @@
 		   || ((c) >= 0x61 && (c) <= 0x7a))
 #define digitchar(c) ((c) >= 0x30 && (c) <= 0x39)
 
-#define borderchar(c) (alphachar(c) || digitchar(c))
-#define middlechar(c) (borderchar(c) || hyphenchar(c) || underscorechar(c))
+#define borderchar(c) (alphachar(c) || digitchar(c) || hyphenchar(c))
+#define middlechar(c) (borderchar(c) || underscorechar(c))
 #define	domainchar(c) ((c) > 0x20 && (c) < 0x7f)
 
 int