diff --git a/src/server.c b/src/server.c
index b6a1bc2..d570e67 100644
--- a/src/server.c
+++ b/src/server.c
@@ -551,7 +551,7 @@
 		memprintf(err, "'%s' : missing value", args[*cur_arg]);
 		return ERR_ALERT | ERR_FATAL;
 	}
-	proto = ist2(args[*cur_arg + 1], strlen(args[*cur_arg + 1]));
+	proto = ist(args[*cur_arg + 1]);
 	newsrv->mux_proto = get_mux_proto(proto);
 	if (!newsrv->mux_proto) {
 		memprintf(err, "'%s' :  unknown MUX protocol '%s'", args[*cur_arg], args[*cur_arg+1]);