diff --git a/src/saveload/misc_sl.cpp b/src/saveload/misc_sl.cpp
--- a/src/saveload/misc_sl.cpp
+++ b/src/saveload/misc_sl.cpp
@@ -26,6 +26,8 @@
 #include "saveload.h"
 
 extern TileIndex _cur_tileloop_tile;
+extern uint16 _disaster_delay;
+extern byte _trees_tick_ctr;
 
 /* Keep track of current game position */
 int _saved_scrollpos_x;