diff --git a/MapCleaner.lua b/MapCleaner.lua
index dc01b4a..c693c61 100755
--- a/MapCleaner.lua
+++ b/MapCleaner.lua
@@ -515,6 +515,7 @@ function MapCleaner:ListVisible()
 end
 
 function MapCleaner:Cli(line)
+  line = line:lower()
   local op, rest = line:match("^(%S*)%s*(.-)$")
   if op == COMMAND_FILTERPOI then
     local id = tonumber(rest)