diff --git a/runtime/lua/vim/lsp/handlers.lua b/runtime/lua/vim/lsp/handlers.lua
index d6a612b9f6..e088940a9d 100644
--- a/runtime/lua/vim/lsp/handlers.lua
+++ b/runtime/lua/vim/lsp/handlers.lua
@@ -107,8 +107,10 @@ RSC['window/showMessageRequest'] = function(_, params, ctx)
       local opts = {
         kind = 'lsp_message',
         prompt = params.message .. ': ',
+        ---@param action lsp.MessageActionItem
+        ---@return string
         format_item = function(action)
-          return (action.title:gsub('\r\n', '\\r\\n')):gsub('\n', '\\n')
+          return (action.title:gsub('\r\n', '\\r\\n'):gsub('\n', '\\n'))
         end,
       }
       vim.ui.select(params.actions, opts, function(choice)