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-rw-r--r--avahi-core/domain-util.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/avahi-core/domain-util.c b/avahi-core/domain-util.c
index ab1ec8d..3aeba12 100644
--- a/avahi-core/domain-util.c
+++ b/avahi-core/domain-util.c
@@ -42,7 +42,10 @@ static void strip_bad_chars(char *s) {
s[strcspn(s, ".")] = 0;
for (p = s, d = s; *p; p++)
- if (isalnum(*p) || *p == '-')
+ if ((*p >= 'a' && *p <= 'z') ||
+ (*p >= 'A' && *p <= 'Z') ||
+ (*p >= '0' && *p <= '9') ||
+ *p == '-')
*(d++) = *p;
*d = 0;