diff --git a/lcl/interfaces/qt/qtwinapi.inc b/lcl/interfaces/qt/qtwinapi.inc
index 193e74e2ce..153b6e3e7f 100644
--- a/lcl/interfaces/qt/qtwinapi.inc
+++ b/lcl/interfaces/qt/qtwinapi.inc
@@ -2260,7 +2260,7 @@ begin
     begin
       // couldn't find way to fix it.
     end;
-    QtDC.fillRect(X, Y, Rect^.Right - Rect^.Left, Rect^.Bottom - Rect^.Top);
+    QtDC.fillRect(Rect^.Left, Rect^.Top, Rect^.Right - Rect^.Left, Rect^.Bottom - Rect^.Top);
   end else
   if ((Options and ETO_OPAQUE) = 0) and (Rect <> nil) and (QtDC.getBKMode = OPAQUE) then
   begin
diff --git a/lcl/interfaces/qt5/qtwinapi.inc b/lcl/interfaces/qt5/qtwinapi.inc
index a78b5d52a8..0651154f89 100644
--- a/lcl/interfaces/qt5/qtwinapi.inc
+++ b/lcl/interfaces/qt5/qtwinapi.inc
@@ -2219,7 +2219,7 @@ begin
   end;
 
   if ((Options and ETO_OPAQUE) <> 0) and (Rect <> nil) then
-    QtDC.fillRect(X, Y, Rect^.Right - Rect^.Left, Rect^.Bottom - Rect^.Top);
+    QtDC.fillRect(Rect^.Left, Rect^.Top, Rect^.Right - Rect^.Left, Rect^.Bottom - Rect^.Top);
 
   if Str <> nil then
   begin