diff --git a/samples/qt/Common/src/OcctWindow.cxx b/samples/qt/Common/src/OcctWindow.cxx
index 767b15f230..0af47c1beb 100644
--- a/samples/qt/Common/src/OcctWindow.cxx
+++ b/samples/qt/Common/src/OcctWindow.cxx
@@ -152,8 +152,8 @@ Standard_Real OcctWindow::Ratio() const
 void OcctWindow::Size ( Standard_Integer& theWidth, Standard_Integer& theHeight ) const
 {
   QRect aRect = myWidget->rect();
-  theWidth  = aRect.right();
-  theHeight = aRect.bottom();
+  theWidth  = aRect.width();
+  theHeight = aRect.height();
 }
 
 // =======================================================================