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-rw-r--r--source4/libcli/nbt/nbtname.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/source4/libcli/nbt/nbtname.c b/source4/libcli/nbt/nbtname.c
index b59c24e7cf..36ffdc9af6 100644
--- a/source4/libcli/nbt/nbtname.c
+++ b/source4/libcli/nbt/nbtname.c
@@ -429,7 +429,7 @@ static const char *nbt_hex_encode(TALLOC_CTX *mem_ctx, const char *s)
int i, len;
char *ret;
const char *valid_chars = "_-.$@ ";
-#define NBT_CHAR_ALLOW(c) (isalnum(c) || strchr(valid_chars, c))
+#define NBT_CHAR_ALLOW(c) (isalnum((unsigned char)c) || strchr(valid_chars, c))
for (len=i=0;s[i];i++,len++) {
if (!NBT_CHAR_ALLOW(s[i])) {