--- a/src/map_func.h	Tue Jun 03 00:23:54 2008 +0000
+++ b/src/map_func.h	Tue Jun 03 02:20:27 2008 +0000
@@ -391,7 +391,7 @@
 /**
  * Searches for some cirumstances of a tile around a given tile with a helper function.
  */
-bool CircularTileSearch(TileIndex tile, uint size, TestTileOnSearchProc proc, uint32 data);
+bool CircularTileSearch(TileIndex *tile, uint size, TestTileOnSearchProc proc, uint32 data);
 
 /**
  * Get a random tile out of a given seed.