diff --git a/Headers/gnustep/gui/NSScroller.h b/Headers/gnustep/gui/NSScroller.h
index 9c8796ca8..6a425a639 100644
--- a/Headers/gnustep/gui/NSScroller.h
+++ b/Headers/gnustep/gui/NSScroller.h
@@ -72,6 +72,7 @@ typedef enum _NSScrollerArrow {
   NSScrollerPart _hitPart;
   NSScrollArrowPosition _arrowsPosition;
   NSUsableScrollerParts _usableParts;
+  BOOL _cacheValid;
 }
 
 //