1 files changed, 4 insertions, 4 deletions

diff --git a/src/ot_config.c b/src/ot_config.c
index 8af6cfc..626ddea 100644
--- a/src/ot_config.c
+++ b/src/ot_config.c
@@ -126,7 +126,7 @@ static const char *set_config_option(const char **option, char *value) {
 #ifdef _DEBUG
   fprintf(stderr, "Setting config option: %s\n", value);
 #endif
-  while (isspace(*value))
+  while (isspace((unsigned char)*value))
     ++value;
   free((char *)*option);
   return *option = strdup(value);
@@ -136,7 +136,7 @@ static int scan_ip6_port(const char *src, ot_ip6 ip, uint16_t *port) {
   const char *s = src;
   uint64_t    value;
   int         off, bracket = 0;
-  while (isspace(*s))
+  while (isspace((unsigned char)*s))
     ++s;
   if (*s == '[')
     ++s, ++bracket; /* for v6 style notation */
@@ -145,7 +145,7 @@ static int scan_ip6_port(const char *src, ot_ip6 ip, uint16_t *port) {
   s += off;
   if (bracket && *s == ']')
     ++s;
-  if (*s == 0 || isspace(*s))
+  if (*s == 0 || isspace((unsigned char)*s))
     return s - src;
   if (!ip_is_v4mapped(ip)) {
     if (*s != ':' && *s != '.')
@@ -167,7 +167,7 @@ static int scan_ip6_net(const char *src, ot_net *net) {
   const char *s = src;
   uint64_t    value;
   int         off;
-  while (isspace(*s))
+  while (isspace((unsigned char)*s))
     ++s;
   if (!(off = ip_parse(s, net->address)))
     return 0;