diff --git a/autoload/futago/internal.vim b/autoload/futago/internal.vim
deleted file mode 100644
index c77f72d..0000000
--- a/autoload/futago/internal.vim
+++ /dev/null
@@ -1,9 +0,0 @@
-function futago#internal#callback_helper(denops_name, bufnr, lambda_id, ...)
-  call setbufvar(a:bufnr, "&buftype", "")
-  call denops#notify(a:denops_name, a:lambda_id, a:000)
-endfunction
-
-function futago#internal#cancel_helper(denops_name)
-  call denops#notify(a:denops_name, "cancel", [])
-  return '<C-c>'
-endfunction