diff --git a/lcl/forms.pp b/lcl/forms.pp
index b52729b552..f73679f689 100644
--- a/lcl/forms.pp
+++ b/lcl/forms.pp
@@ -197,6 +197,8 @@ type
     property BiDiMode;
     property BorderStyle;
     property ChildSizing;
+    property ClientHeight;
+    property ClientWidth;
     property Constraints;
     property DockSite;
     property DragCursor;