diff --git a/runtime/ftplugin/lua.lua b/runtime/ftplugin/lua.lua
index 7c54b2cb1e..fde121d769 100644
--- a/runtime/ftplugin/lua.lua
+++ b/runtime/ftplugin/lua.lua
@@ -4,7 +4,8 @@ vim.treesitter.start()
 vim.bo.includeexpr = [[v:lua.require'vim._ftplugin.lua'.includeexpr(v:fname)]]
 vim.bo.omnifunc = 'v:lua.vim.lua_omnifunc'
 vim.wo[0][0].foldexpr = 'v:lua.vim.treesitter.foldexpr()'
+vim.wo[0][0].foldmethod = 'expr'
 
 vim.b.undo_ftplugin = (vim.b.undo_ftplugin or '')
   .. '\n call v:lua.vim.treesitter.stop()'
-  .. '\n setl omnifunc< foldexpr< includeexpr<'
+  .. '\n setl omnifunc< foldexpr< foldmethod< includeexpr<'