diff --git a/include/proto/server.h b/include/proto/server.h
index d75cc9f..99af0d4 100644
--- a/include/proto/server.h
+++ b/include/proto/server.h
@@ -39,7 +39,7 @@
 int srv_lastsession(const struct server *s);
 int srv_getinter(const struct check *check);
 int parse_server(const char *file, int linenum, char **args, struct proxy *curproxy, struct proxy *defproxy);
-int update_server_addr(struct server *s, void *ip, int ip_sin_family, char *updater);
+int update_server_addr(struct server *s, void *ip, int ip_sin_family, const char *updater);
 struct server *server_find_by_id(struct proxy *bk, int id);
 struct server *server_find_by_name(struct proxy *bk, const char *name);
 struct server *server_find_best_match(struct proxy *bk, char *name, int id, int *diff);
diff --git a/src/server.c b/src/server.c
index cd32e80..4e8f835 100644
--- a/src/server.c
+++ b/src/server.c
@@ -2558,7 +2558,7 @@
  *
  * A log line and a stderr warning message is generated based on server's backend options.
  */
-int update_server_addr(struct server *s, void *ip, int ip_sin_family, char *updater)
+int update_server_addr(struct server *s, void *ip, int ip_sin_family, const char *updater)
 {
 	/* generates a log line and a warning on stderr */
 	if (1) {