diff --git a/lcl/include/intfbaselcl.inc b/lcl/include/intfbaselcl.inc
index 65ded84e8d..29245ae94d 100644
--- a/lcl/include/intfbaselcl.inc
+++ b/lcl/include/intfbaselcl.inc
@@ -491,6 +491,11 @@ begin
   Result:=true;
 end;
 
+function TWidgetSet.IsDesignerDC(WindowHandle: HWND; DC: HDC): Boolean;
+begin
+  Result := False;
+end;
+
 function TWidgetSet.LoadStockPixmap(StockID: longint; var Mask: HBitmap) : HBitmap;
 begin
   Mask := 0;
diff --git a/lcl/include/lclintf.inc b/lcl/include/lclintf.inc
index 1675821037..ef51b5cc3e 100644
--- a/lcl/include/lclintf.inc
+++ b/lcl/include/lclintf.inc
@@ -369,6 +369,11 @@ begin
   Result := WidgetSet.InvalidateFrame(aHandle,ARect,bErase,BorderWidth);
 end;
 
+function IsDesignerDC(WindowHandle: HWND; DC: HDC): Boolean;
+begin
+  Result := WidgetSet.IsDesignerDC(WindowHandle, DC);
+end;
+
 function LoadStockPixmap(StockID: longint; var Mask: HBitmap) : HBitmap;
 begin
   Result := WidgetSet.LoadStockPixmap(StockID, Mask);
diff --git a/lcl/include/lclintfh.inc b/lcl/include/lclintfh.inc
index 77dd379887..16f296cd6b 100644
--- a/lcl/include/lclintfh.inc
+++ b/lcl/include/lclintfh.inc
@@ -102,6 +102,7 @@ function GetWindowRelativePosition(Handle : hwnd; var Left, Top: integer): boole
 function IntfSendsUTF8KeyPress: Boolean; {$IFDEF IF_BASE_MEMBER}virtual;{$ENDIF}
 function InvalidateFrame(aHandle : HWND; ARect : pRect; bErase : Boolean; BorderWidth: integer) : Boolean; {$IFDEF IF_BASE_MEMBER}virtual;{$ENDIF}
 
+function IsDesignerDC(WindowHandle: HWND; DC: HDC): Boolean; {$IFDEF IF_BASE_MEMBER}virtual;{$ENDIF}
 function LoadStockPixmap(StockID: longint; var Mask: HBitmap) : HBitmap; {$IFDEF IF_BASE_MEMBER}virtual;{$ENDIF}
 
 function MoveWindowOrgEx(dc : hdc; dX,dY : Integer): boolean; {$IFDEF IF_BASE_MEMBER}virtual;{$ENDIF}