diff --git a/include/ebtables_u.h b/include/ebtables_u.h
index d86a7c7..c08e72a 100644
--- a/include/ebtables_u.h
+++ b/include/ebtables_u.h
@@ -198,6 +198,7 @@
 void get_db(int len, struct brdb_dbentry *db);
 void deliver_allowdb(__u16 *decision);
 int name_to_protocol(char *name);
+int number_to_name(unsigned short proto, char *name);
 void check_option(unsigned int *flags, unsigned int mask);
 int check_inverse(const char option[]);
 #define print_bug(format, args...) \