diff --git a/lcl/interfaces/qt5/qtwinapi.inc b/lcl/interfaces/qt5/qtwinapi.inc
index 2dcfcc2676..ce4ee881cc 100644
--- a/lcl/interfaces/qt5/qtwinapi.inc
+++ b/lcl/interfaces/qt5/qtwinapi.inc
@@ -4440,7 +4440,13 @@ begin
   {$endif}
   if Handle = 0 then
     Exit(False);
-  R := TQtWidget(Handle).getFrameGeometry;
+  if QWidget_isTopLevel(TQtWidget(Handle).Widget) then
+  begin
+    R := Rect(0, 0, 0, 0);
+    if GetWindowRect(Handle, R) = 0 then
+      R := TQtWidget(Handle).getFrameGeometry;
+  end else
+    R := TQtWidget(Handle).getFrameGeometry;
   Left := R.Left;
   Top := R.Top;
   Result := True;
diff --git a/lcl/interfaces/qt6/qtwinapi.inc b/lcl/interfaces/qt6/qtwinapi.inc
index adaa831b72..b98e55c80c 100644
--- a/lcl/interfaces/qt6/qtwinapi.inc
+++ b/lcl/interfaces/qt6/qtwinapi.inc
@@ -4467,7 +4467,13 @@ begin
   {$endif}
   if Handle = 0 then
     Exit(False);
-  R := TQtWidget(Handle).getFrameGeometry;
+  if QWidget_isTopLevel(TQtWidget(Handle).Widget) then
+  begin
+    R := Rect(0, 0, 0, 0);
+    if GetWindowRect(Handle, R) = 0 then
+      R := TQtWidget(Handle).getFrameGeometry;
+  end else
+    R := TQtWidget(Handle).getFrameGeometry;
   Left := R.Left;
   Top := R.Top;
   Result := True;