Index: src/map/tile.h
--- src/map/tile.h.orig
+++ src/map/tile.h
@@ -38,7 +38,8 @@ class Tile : public Rectanglei
 public:
   typedef struct
   {
-    uint16_t index, new_crc;
+    uint32_t index;
+    uint16_t new_crc;
   } SynchTileInfo;
   typedef std::vector<SynchTileInfo> SynchTileList;
 
