diff --git a/wire/ext_idle_notifier_v1.txt b/wire/ext_idle_notifier_v1.txt
index bf3e1e10..fc3d2daa 100644
--- a/wire/ext_idle_notifier_v1.txt
+++ b/wire/ext_idle_notifier_v1.txt
@@ -9,7 +9,7 @@ request get_idle_notification {
     seat: id(wl_seat),
 }
 
-request get_input_idle_notification {
+request get_input_idle_notification (since = 2) {
     id: id(ext_idle_notification_v1),
     timeout: u32,
     seat: id(wl_seat),