diff --git a/lib/sockunion.h b/lib/sockunion.h
index ea3b833..a6f964f 100644
--- a/lib/sockunion.h
+++ b/lib/sockunion.h
@@ -89,6 +89,11 @@
 extern int sockunion_same (const union sockunion *, const union sockunion *);
 extern unsigned int sockunion_hash (const union sockunion *);
 
+extern size_t family2addrsize(int family);
+extern size_t sockunion_get_addrlen(const union sockunion *);
+extern const u_char *sockunion_get_addr(const union sockunion *);
+extern void sockunion_set(union sockunion *, int family, const u_char *addr, size_t bytes);
+
 extern union sockunion *sockunion_str2su (const char *str);
 extern int sockunion_accept (int sock, union sockunion *);
 extern int sockunion_stream_socket (union sockunion *);