diff --git a/common/parse.c b/common/parse.c
index d9f01a8ad5430cf69a8278dc51b6b68cf13b2183..01eced4ee8c433b00068f1e8b534c1e9bee8a48f 100644
--- a/common/parse.c
+++ b/common/parse.c
@@ -343,7 +343,7 @@ int parse_ip_addr (cfile, addr)
 static int
 is_hex_string(const char *s) {
 	while (*s != '\0') {
-		if (!isxdigit(*s)) {
+		if (!isxdigit((int)*s)) {
 			return 0;
 		}
 		s++;
@@ -4837,7 +4837,7 @@ struct option *option;
 			fmt = option->format;
 
 		/* 'a' means always uniform */
-		if ((fmt[0] != '\0') && (tolower(fmt[1]) == 'a')) 
+		if ((fmt[0] != '\0') && (tolower((int)fmt[1]) == 'a')) 
 			uniform = 1;
 
 		do {
diff --git a/common/print.c b/common/print.c
index c7bad1049d9b60f096d34a27d93f23125abd818f..44e0ce15f0de5f865be59912cb2e75928267cb46 100644
--- a/common/print.c
+++ b/common/print.c
@@ -45,7 +45,7 @@ char *quotify_string (const char *s, const char *file, int line)
 	for (sp = s; sp && *sp; sp++) {
 		if (*sp == ' ')
 			len++;
-		else if (!isascii (*sp) || !isprint (*sp))
+		else if (!isascii ((int)*sp) || !isprint ((int)*sp))
 			len += 4;
 		else if (*sp == '"' || *sp == '\\')
 			len += 2;
@@ -59,7 +59,7 @@ char *quotify_string (const char *s, const char *file, int line)
 		for (sp = s; sp && *sp; sp++) {
 			if (*sp == ' ')
 				*nsp++ = ' ';
-			else if (!isascii (*sp) || !isprint (*sp)) {
+			else if (!isascii ((int)*sp) || !isprint ((int)*sp)) {
 				sprintf (nsp, "\\%03o",
 					 *(const unsigned char *)sp);
 				nsp += 4;
diff --git a/minires/res_init.c b/minires/res_init.c
index c2c744e3ff9c3ff3472fe6ca704fe97dd3867f35..b96b326bc2d9da9a8404aa5d7816f0487aab1b56 100644
--- a/minires/res_init.c
+++ b/minires/res_init.c
@@ -76,7 +76,7 @@
 
 #if defined(LIBC_SCCS) && !defined(lint)
 static const char sccsid[] = "@(#)res_init.c	8.1 (Berkeley) 6/7/93";
-static const char rcsid[] = "$Id: res_init.c,v 1.9 2007/09/05 17:32:10 dhankins Exp $";
+static const char rcsid[] = "$Id: res_init.c,v 1.10 2007/10/01 14:47:35 explorer Exp $";
 #endif /* LIBC_SCCS and not lint */
 
 #include <sys/types.h>
@@ -321,7 +321,7 @@ minires_vinit(res_state statp, int preinit) {
 			    break;
 			net = cp;
 			while (*cp && !ISSORTMASK(*cp) && *cp != ';' &&
-			       isascii(*cp) && !isspace(*cp))
+			       isascii((int)*cp) && !isspace((int)*cp))
 				cp++;
 			n = *cp;
 			*cp = 0;
@@ -331,7 +331,7 @@ minires_vinit(res_state statp, int preinit) {
 				*cp++ = n;
 				net = cp;
 				while (*cp && *cp != ';' &&
-					isascii(*cp) && !isspace(*cp))
+					isascii((int)*cp) && !isspace((int)*cp))
 				    cp++;
 				n = *cp;
 				*cp = 0;