diff --git a/widget/contrib/tp_smapi.lua b/widget/contrib/tp_smapi.lua
index 06b3cbd..e6da918 100644
--- a/widget/contrib/tp_smapi.lua
+++ b/widget/contrib/tp_smapi.lua
@@ -10,6 +10,7 @@ local helpers = require("lain.helpers")
 local focused = require("awful.screen").focused
 local gears   = require("gears")
 local naughty = require("naughty")
+local wibox   = require("wibox")
 local string  = string
 
 -- ThinkPad battery infos and widget creator