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-rw-r--r--slirp/ip6.h6
1 files changed, 3 insertions, 3 deletions
diff --git a/slirp/ip6.h b/slirp/ip6.h
index 0908855f0f..b1bea43b3c 100644
--- a/slirp/ip6.h
+++ b/slirp/ip6.h
@@ -57,9 +57,9 @@ static inline bool in6_equal_mach(const struct in6_addr *a,
const struct in6_addr *b,
int prefix_len)
{
- if (memcmp(&(a->s6_addr[(prefix_len + 7) / 8]),
- &(b->s6_addr[(prefix_len + 7) / 8]),
- 16 - (prefix_len + 7) / 8) != 0) {
+ if (memcmp(&(a->s6_addr[DIV_ROUND_UP(prefix_len, 8)]),
+ &(b->s6_addr[DIV_ROUND_UP(prefix_len, 8)]),
+ 16 - DIV_ROUND_UP(prefix_len, 8)) != 0) {
return 0;
}