diff --git a/widgets/maildir.lua b/widgets/maildir.lua
index cb96a30..eed6138 100644
--- a/widgets/maildir.lua
+++ b/widgets/maildir.lua
@@ -14,6 +14,7 @@ local wibox           = require("wibox")
 
 local util            = require("lain.util")
 
+local io              = { popen  = io.popen }
 local os              = { getenv = os.getenv }
 local pairs           = pairs
 local string          = { len    = string.len,