diff --git a/lcl/forms.pp b/lcl/forms.pp
index 431e559f0a..b3d3911214 100644
--- a/lcl/forms.pp
+++ b/lcl/forms.pp
@@ -268,6 +268,8 @@ type
     property Anchors;
     property AutoScroll;
     property AutoSize;
+    property ClientWidth;
+    property ClientHeight;
     property Constraints;
     property DockSite;
     property DragCursor;