diff --git a/runtime/lua/vim/filetype.lua b/runtime/lua/vim/filetype.lua
index b61fc528f5..b236554ef6 100644
--- a/runtime/lua/vim/filetype.lua
+++ b/runtime/lua/vim/filetype.lua
@@ -170,7 +170,7 @@ local extension = {
     return require('vim.filetype.detect').bindzone(bufnr, 'dcl')
   end,
   db = function(path, bufnr)
-    return require('vim.filetype.detect').bindzone(bufnr, '')
+    return require('vim.filetype.detect').bindzone(bufnr)
   end,
   bicep = 'bicep',
   bb = 'bitbake',