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-rw-r--r--src/utils/common.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/utils/common.c b/src/utils/common.c
index e74a2ae..9c7d0d4 100644
--- a/src/utils/common.c
+++ b/src/utils/common.c
@@ -86,7 +86,7 @@ int hwaddr_masked_aton(const char *txt, u8 *addr, u8 *mask, u8 maskable)
return -1;
/* check for optional mask */
- if (*r == '\0' || isspace(*r)) {
+ if (*r == '\0' || isspace((unsigned char) *r)) {
/* no mask specified, assume default */
os_memset(mask, 0xff, ETH_ALEN);
} else if (maskable && *r == '/') {