diff --git a/leaderboard.lua b/leaderboard.lua
index 1509d8a..bc633b5 100644
--- a/leaderboard.lua
+++ b/leaderboard.lua
@@ -165,7 +165,7 @@ local function mapChecksum(mapnum)
 		return nil
 	end
 
-	local digest = string.format("%02x", djb2(mh.lvlttl+mh.subttl+mh.zonttl))
+	local digest = string.format("%04x", djb2(mh.lvlttl+mh.subttl+mh.zonttl))
 	return string.sub(digest, #digest - 3)
 end
 
@@ -173,13 +173,13 @@ local function setST(t, map, flags, scoreTable)
 	local mode = flags & ST_SEP
 	local cks = mapChecksum(map)
 	t[mode] = t[mode] or {}
-	t[mode][map + (cks or "")] = scoreTable
+	t[mode][tostring(map)..(cks or "")] = scoreTable
 end
 
 local function getST(t, map, flags)
 	local mode = flags & ST_SEP
 	local cks = mapChecksum(map)
-	return t[mode] and t[mode][map + (cks or "")] or nil
+	return t[mode] and t[mode][tostring(map)..(cks or "")] or nil
 end
 
 local function setScoreTable(map, flags, scoreTable)