diff --git a/Client/UUoaDesigns.pas b/Client/UUoaDesigns.pas
index c1008fd..ce49ecd 100644
--- a/Client/UUoaDesigns.pas
+++ b/Client/UUoaDesigns.pas
@@ -62,6 +62,9 @@ type
 
 implementation
 
+uses
+  Math;
+
 function ReadString(AStream: TStream): String;
 var
   nonNullFlag: Byte;
@@ -104,7 +107,7 @@ begin
     tile.TileID := ReadInt;
     tile.X := ReadInt;
     tile.Y := ReadInt;
-    tile.Z := ReadInt;
+    tile.Z := EnsureRange(ReadInt, -128, 127);
     ReadInt; // Level; unused
 
     if version = 1 then