diff --git a/qad/blockview/blockview.cpp b/qad/blockview/blockview.cpp
index 3aa7007..498e094 100644
--- a/qad/blockview/blockview.cpp
+++ b/qad/blockview/blockview.cpp
@@ -1826,7 +1826,10 @@ void BlockView::_setNav(QRectF v) {
 	if (vw < 1. || vh < 1. || v.isEmpty()) return;
 	QTransform matrix;
 	double scl = qMin(vw / v.width(), vh / v.height());
+	double ascl = appScale(this);
+	scl = qMin(qMax(scl, 0.02 * ascl), 50. * ascl);
 	matrix.scale(scl, scl);
+	//qDebug() << scl;
 	QGraphicsView::setTransform(matrix);
 	QGraphicsView::centerOn(v.center());
 }