--- a/gui.h	Sat Dec 24 13:22:38 2005 +0000
+++ b/gui.h	Sat Dec 24 15:01:17 2005 +0000
@@ -126,7 +126,7 @@
 
 /* network gui */
 void ShowNetworkGameWindow(void);
-void ShowChatWindow(StringID str, StringID caption, int maxlen, int maxwidth, byte window_class, uint16 window_number);
+void ShowChatWindow(StringID str, StringID caption, int maxlen, int maxwidth, WindowClass window_class, WindowNumber window_number);
 
 /* bridge_gui.c */
 void ShowBuildBridgeWindow(uint start, uint end, byte type);