diff --git a/src/server.c b/src/server.c
index ea6a325be..c73ffb33b 100644
--- a/src/server.c
+++ b/src/server.c
@@ -5009,7 +5009,12 @@ static int cli_parse_add_server(char **args, char *payload, struct appctx *appct
 	srv->init_addr_methods = SRV_IADDR_NONE;
 
 	if (srv->mux_proto) {
-		if (!conn_get_best_mux_entry(srv->mux_proto->token, PROTO_SIDE_BE, be->mode)) {
+		int proto_mode = conn_pr_mode_to_proto_mode(be->mode);
+		const struct mux_proto_list *mux_ent;
+
+		mux_ent = conn_get_best_mux_entry(srv->mux_proto->token, PROTO_SIDE_BE, proto_mode);
+
+		if (!mux_ent || !isteq(mux_ent->token, srv->mux_proto->token)) {
 			ha_alert("MUX protocol is not usable for server.\n");
 			goto out;
 		}