diff --git a/runtime/ftplugin/lua.vim b/runtime/ftplugin/lua.vim
index 57c5887a86..3fbdc73d8e 100644
--- a/runtime/ftplugin/lua.vim
+++ b/runtime/ftplugin/lua.vim
@@ -78,4 +78,7 @@ function s:LuaInclude(fname) abort
   return fname
 endfunction
 
+let &cpo = s:cpo_save
+unlet s:cpo_save
+
 " vim: nowrap sw=2 sts=2 ts=8 noet: