diff --git a/src/adapter.c b/src/adapter.c
index e2e466d..dafe595 100644
--- a/src/adapter.c
+++ b/src/adapter.c
@@ -1317,9 +1317,6 @@ static DBusMessage *list_devices(DBusConnection *conn,
 	DBusMessageIter array_iter;
 	const gchar *dev_path;
 
-	if (!dbus_message_has_signature(msg, DBUS_TYPE_INVALID_AS_STRING))
-		return btd_error_invalid_args(msg);
-
 	reply = dbus_message_new_method_return(msg);
 	if (!reply)
 		return NULL;