diff --git a/Headers/gnustep/gui/NSWindow.h b/Headers/gnustep/gui/NSWindow.h
index 2f274b352..e325a93f8 100644
--- a/Headers/gnustep/gui/NSWindow.h
+++ b/Headers/gnustep/gui/NSWindow.h
@@ -58,6 +58,7 @@
 @class NSToolbar;
 @class NSView;
 @class NSWindowController;
+@class NSCachedImageRep;
 
 /*
  * Window levels are taken from MacOS-X
@@ -141,6 +142,9 @@ APPKIT_EXPORT NSSize NSTokenSize;
 
   NSToolbar    *_toolbar;
 
+  NSCachedImageRep *_cachedImage;
+  NSPoint       _cachedImageOrigin;
+
   struct GSWindowFlagsType {
     unsigned	accepts_drag:1;
     unsigned	is_one_shot:1;