diff --git a/src/include/ui.h b/src/include/ui.h
index 722573d3c..7ff531ac7 100644
--- a/src/include/ui.h
+++ b/src/include/ui.h
@@ -214,7 +214,8 @@ typedef struct _ui_ {
 extern UI TheUI;			/// The user interface
 extern UI** UI_Table;			/// All available user interfaces
 
-extern char RightButtonAttacks;		/// right button 0 move, 1 attack
+extern char RightButtonAttacks;		/// right button 0 move, 1 attack.
+extern char FancyBuildings;		/// Mirror buildings 1 yes, 0 now.
 
 /*----------------------------------------------------------------------------
 --	Functions