diff --git a/src/engine/controller.ml b/src/engine/controller.ml
index 804890f..1750712 100644
--- a/src/engine/controller.ml
+++ b/src/engine/controller.ml
@@ -64,4 +64,12 @@ let setup (window : Window.window) =
     ()
   in
   let _listener = Brr.Ev.listen Brr.Ev.keydown callback target in
+  let mobile_callback (ev : Brr.Ev.Pointer.t Brr.Ev.t) =
+    let type_ = Brr.Ev.Pointer.type' (Brr.Ev.as_type ev) |> Jstr.to_string in
+    if String.equal "touch" type_ then
+      let _ : unit Fut.t = Next.go_next window 1 in
+      ()
+    else ()
+  in
+  let _listener = Brr.Ev.listen Brr.Ev.pointerup mobile_callback target in
   ()
diff --git a/src/previewer/previewer.ml b/src/previewer/previewer.ml
index c85d888..9725532 100644
--- a/src/previewer/previewer.ml
+++ b/src/previewer/previewer.ml
@@ -6,7 +6,6 @@ end
 
 type previewer = { stage : int ref; index : int ref; panels : Brr.El.t array }
 
-let string_of_stage stage = string_of_int stage
 let ids = [| "p1"; "p2" |]
 
 let create_previewer ?(initial_stage = 0) ?(callback = fun _ -> ()) root =