diff --git a/src/saveload/oldloader.h b/src/saveload/oldloader.h
--- a/src/saveload/oldloader.h
+++ b/src/saveload/oldloader.h
@@ -14,7 +14,7 @@
 #include "../tile_type.h"
 
 static const uint BUFFER_SIZE = 4096;
-static const uint OLD_MAP_SIZE = 256 * 256;
+static const uint OLD_MAP_SIZE = 256;
 
 struct LoadgameState {
 	FILE *file;