cast to int for isxdigit

diff --git a/interface.c b/interface.c
index e634c18a9e7a3365a7e24bb34d53e4055c838f9c..6ff5a7c47238b14902e064fcf81d2f800daec960 100644 (file)
--- a/interface.c
+++ b/interface.c
@@ -169,7 +169,7 @@ size_t hwaddr_aton (unsigned char *buffer, const char *addr)
                        return (0);
                }
                /* Ensure that digits are hex */
-               if (isxdigit (c[0]) == 0 || isxdigit (c[1]) == 0) {
+               if (isxdigit ((int) c[0]) == 0 || isxdigit ((int) c[1]) == 0) {
                        errno = EINVAL;
                        return (0);
                }