diff --git a/lib/isc/inet_aton.c b/lib/isc/inet_aton.c
index dacc10944a..2732398dca 100644
--- a/lib/isc/inet_aton.c
+++ b/lib/isc/inet_aton.c
@@ -71,7 +71,7 @@
 
 #if defined(LIBC_SCCS) && !defined(lint)
 static char sccsid[] = "@(#)inet_addr.c	8.1 (Berkeley) 6/17/93";
-static char rcsid[] = "$Id: inet_aton.c,v 1.21 2007/06/19 23:47:17 tbox Exp $";
+static char rcsid[] = "$Id: inet_aton.c,v 1.22 2008/12/01 13:26:51 marka Exp $";
 #endif /* LIBC_SCCS and not lint */
 
 #include <config.h>
@@ -145,7 +145,7 @@ isc_net_aton(const char *cp, struct in_addr *addr) {
 			 *	a.b.c	(with c treated as 16 bits)
 			 *	a.b	(with b treated as 24 bits)
 			 */
-			if (pp >= parts + 3 || val > 0xff)
+			if (pp >= parts + 3 || val > 0xffU)
 				return (0);
 			*pp++ = (isc_uint8_t)val;
 			c = *++cp;
@@ -172,19 +172,19 @@ isc_net_aton(const char *cp, struct in_addr *addr) {
 		break;
 
 	case 2:				/* a.b -- 8.24 bits */
-		if (val > 0xffffff)
+		if (val > 0xffffffU)
 			return (0);
 		val |= parts[0] << 24;
 		break;
 
 	case 3:				/* a.b.c -- 8.8.16 bits */
-		if (val > 0xffff)
+		if (val > 0xffffU)
 			return (0);
 		val |= (parts[0] << 24) | (parts[1] << 16);
 		break;
 
 	case 4:				/* a.b.c.d -- 8.8.8.8 bits */
-		if (val > 0xff)
+		if (val > 0xffU)
 			return (0);
 		val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
 		break;