diff --git a/lua/avante/providers/copilot.lua b/lua/avante/providers/copilot.lua
index 197cff2..bfdbeb6 100644
--- a/lua/avante/providers/copilot.lua
+++ b/lua/avante/providers/copilot.lua
@@ -104,8 +104,10 @@ H.get_oauth_token = function()
   ---@type string
   local config_dir
 
-  if vim.tbl_contains({ "linux", "darwin" }, os_name) then
-    config_dir = (xdg_config and vim.fn.isdirectory(xdg_config) > 0) and xdg_config or vim.fn.expand("~/.config")
+  if xdg_config and vim.fn.isdirectory(xdg_config) > 0 then
+    config_dir = xdg_config
+  elseif vim.tbl_contains({ "linux", "darwin" }, os_name) then
+    config_dir = vim.fn.expand("~/.config")
   else
     config_dir = vim.fn.expand("~/AppData/Local")
   end