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-rw-r--r--lib/prefix.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/prefix.h b/lib/prefix.h
index e338140f1a..24c146e022 100644
--- a/lib/prefix.h
+++ b/lib/prefix.h
@@ -470,7 +470,7 @@ extern void masklen2ip6(const int, struct in6_addr *);
extern const char *inet6_ntoa(struct in6_addr);
-extern int is_zero_mac(struct ethaddr *mac);
+extern int is_zero_mac(const struct ethaddr *mac);
extern int prefix_str2mac(const char *str, struct ethaddr *mac);
extern char *prefix_mac2str(const struct ethaddr *mac, char *buf, int size);