diff --git a/src/server.c b/src/server.c
index 5cf0eacdfd..73a73232e4 100644
--- a/src/server.c
+++ b/src/server.c
@@ -2000,8 +2000,7 @@ static void display_parser_err(const char *file, int linenum, char **args, int c
 		ha_alert("%s%s%s%s.\n", msg, quote, token, quote);
 }
 
-static void srv_conn_src_sport_range_cpy(struct server *srv,
-                                            struct server *src)
+static void srv_conn_src_sport_range_cpy(struct server *srv, const struct server *src)
 {
 	int range_sz;
 
@@ -2022,7 +2021,7 @@ static void srv_conn_src_sport_range_cpy(struct server *srv,
 /*
  * Copy <src> server connection source settings to <srv> server everything needed.
  */
-static void srv_conn_src_cpy(struct server *srv, struct server *src)
+static void srv_conn_src_cpy(struct server *srv, const struct server *src)
 {
 	srv->conn_src.opts = src->conn_src.opts;
 	srv->conn_src.source_addr = src->conn_src.source_addr;
@@ -2048,7 +2047,7 @@ static void srv_conn_src_cpy(struct server *srv, struct server *src)
  * everything needed.
  */
 #if defined(USE_OPENSSL)
-static void srv_ssl_settings_cpy(struct server *srv, struct server *src)
+static void srv_ssl_settings_cpy(struct server *srv, const struct server *src)
 {
 	/* <src> is the current proxy's default server and SSL is enabled */
 	BUG_ON(src->ssl_ctx.ctx != NULL); /* the SSL_CTX must never be initialized in a default-server */
@@ -2170,7 +2169,7 @@ int srv_prepare_for_resolution(struct server *srv, const char *hostname)
  * <srv_tmpl> distinguishes these two cases (must be 1 if <srv> is a template,
  * 0 if not).
  */
-static void srv_settings_cpy(struct server *srv, struct server *src, int srv_tmpl)
+static void srv_settings_cpy(struct server *srv, const struct server *src, int srv_tmpl)
 {
 	/* Connection source settings copy */
 	srv_conn_src_cpy(srv, src);