diff --git a/lcl/interfaces/carbon/carbonprivate.pp b/lcl/interfaces/carbon/carbonprivate.pp
index 1c76b36a70..1ee340f5c7 100644
--- a/lcl/interfaces/carbon/carbonprivate.pp
+++ b/lcl/interfaces/carbon/carbonprivate.pp
@@ -173,6 +173,8 @@ type
 
     procedure DestroyWidget; override;
   public
+    function GetPreferredSize: TPoint; override;
+
     procedure AddToWidget(AParent: TCarbonWidget); override;
     function GetMousePos: TPoint; override;
     function GetTopParentWindow: WindowRef; override;
diff --git a/lcl/interfaces/carbon/carbonprivatecontrol.inc b/lcl/interfaces/carbon/carbonprivatecontrol.inc
index 09b7186460..ef1ca9f1b5 100644
--- a/lcl/interfaces/carbon/carbonprivatecontrol.inc
+++ b/lcl/interfaces/carbon/carbonprivatecontrol.inc
@@ -1070,6 +1070,7 @@ function TCarbonControl.GetPreferredSize: TPoint;
 var
   R: MacOSAll.Rect;
   S: SmallInt;
+  b: HIRect;
 begin
   Result.X := 0;
   Result.Y := 0;
@@ -1078,7 +1079,7 @@ begin
   
   if OSError(GetBestControlRect(ControlRef(Widget), R, S), Self,
     'GetPreferredSize', 'GetBestControlRect') then Exit;
-  
+
   Result.X := R.right - R.left;
   Result.Y := R.bottom - R.top;
 end;
diff --git a/lcl/interfaces/carbon/carbonprivatewindow.inc b/lcl/interfaces/carbon/carbonprivatewindow.inc
index 22fadfdbb6..8b5c07ae2d 100644
--- a/lcl/interfaces/carbon/carbonprivatewindow.inc
+++ b/lcl/interfaces/carbon/carbonprivatewindow.inc
@@ -1242,6 +1242,16 @@ begin
   //Widget := nil;
 end;
 
+function TCarbonWindow.GetPreferredSize: TPoint;
+const
+  MinWinSize = 20;
+begin
+  //todo: find a proper way to determine prefered window size
+  //      by default Carbon returns a height too large
+  Result.x:=MinWinSize;
+  Result.y:=MinWinSize;
+end;
+
 {------------------------------------------------------------------------------
   Method:  TCarbonWindow.AddToWidget
   Params:  AParent - Parent widget