diff --git a/src/ui/dialog/transformation.cpp b/src/ui/dialog/transformation.cpp
index 498ad78..97334fb 100644
--- a/src/ui/dialog/transformation.cpp
+++ b/src/ui/dialog/transformation.cpp
@@ -606,16 +606,17 @@ void Transformation::updatePageScale(Inkscape::Selection *selection)
     if (selection && !selection->isEmpty()) {
         Geom::OptRect bbox = selection->preferredBounds();
         if (bbox) {
             double w = bbox->dimensions()[Geom::X];
             double h = bbox->dimensions()[Geom::Y];
             _scalar_scale_horizontal.setHundredPercent(w);
             _scalar_scale_vertical.setHundredPercent(h);
             onScaleXValueChanged(); // to update x/y proportionality if switch is on
+            _scalar_scale_vertical.setProgrammatically = false;
             _page_scale.set_sensitive(true);
         } else {
             _page_scale.set_sensitive(false);
         }
     } else {
         _page_scale.set_sensitive(false);
     }
 }