--- a/src/industry_map.h	Sat Aug 25 20:32:18 2007 +0000
+++ b/src/industry_map.h	Sun Aug 26 00:23:32 2007 +0000
@@ -48,6 +48,7 @@
 	GFX_BUBBLE_CATCHER                 = 162,
 	GFX_TOFFEE_QUARY                   = 165,
 	GFX_SUGAR_MINE_SIEVE               = 174,
+	GFX_WATERTILE_SPECIALCHECK         = 255,  ///< not really a tile, but rather a very special check
 };
 
 /**