diff --git a/boot_js.ml b/boot_js.ml
index 4784d15..b816c21 100644
--- a/boot_js.ml
+++ b/boot_js.ml
@@ -118,5 +118,6 @@ let _ =
         images);
   buffered_loop (make_event Dom_html.Event.keydown) Dom_html.document
     (fun ev _ ->
+      Dom.preventDefault ev;
       Lwt.return
       @@ push_event (Some (`Keys [ Event_js.evt_of_jskey ev ])))
diff --git a/human.ml b/human.ml
index 29025b6..103d419 100644
--- a/human.ml
+++ b/human.ml
@@ -3163,7 +3163,7 @@ module Widgets = struct
                                  else `Unhandled))
                      | [ (`Uchar u, [ `Ctrl ]) ] when eq_uc_c u 'k' ->
                          `Handled
-                     | [ (`Uchar u, [ `Ctrl ]) ] when eq_uc_c u 'x' ->
+                     | [ (`Uchar s, [ `Ctrl ]) ] when eq_uc_c s 's' ->
                          let b = Buffer.create 1024 in
                          Lwd_table.iter
                            (fun line ->