--- a/src/industry.h	Wed Apr 18 22:41:53 2007 +0000
+++ b/src/industry.h	Thu Apr 19 14:50:01 2007 +0000
@@ -13,6 +13,7 @@
 
 enum {
 	INVALID_INDUSTRY = 0xFFFF,
+	NUM_INDUSTRYTYPES = 37,
 	INDUTILE_NOANIM = 0xFF,        ///< flag to mark industry tiles as having no animation
 };