diff --git a/res/scripts/stdmin.lua b/res/scripts/stdmin.lua
index e38a39ef..9a955fff 100644
--- a/res/scripts/stdmin.lua
+++ b/res/scripts/stdmin.lua
@@ -159,6 +159,9 @@ function string.trim_left(s, char)
     return string.match(s, "^" .. char .. "*(.+)$") or s
 end
 
+string.lower = utf8.lower
+string.upper = utf8.upper
+
 local meta = getmetatable("")
 
 function meta:__index(key)