diff --git a/Packages/Qt_widget/src/CGALQt/Qt_widget.C b/Packages/Qt_widget/src/CGALQt/Qt_widget.C
index 0cd5f378d65..87da790515c 100644
--- a/Packages/Qt_widget/src/CGALQt/Qt_widget.C
+++ b/Packages/Qt_widget/src/CGALQt/Qt_widget.C
@@ -379,7 +379,7 @@ void Qt_widget::zoom(double ratio)
 {
   zoom(ratio,
        xmin + (xmax - xmin) / 2 ,
-       xmin + (ymax - ymin) / 2 );
+       ymin + (ymax - ymin) / 2 );
 }
 
 #ifdef CGAL_USE_GMP