diff --git a/qad/blockview/blockview.cpp b/qad/blockview/blockview.cpp
index db628a0..8525b10 100644
--- a/qad/blockview/blockview.cpp
+++ b/qad/blockview/blockview.cpp
@@ -1279,11 +1279,11 @@ void BlockView::trace(QPointF scene_pos_from, QPointF scene_pos_to, BlockBusItem
 					sx *= signx;
 					sy *= signy;
 					//qDebug() << "fill" << p0 << "->" << p1 << "in" << steps << sx << sy;
-					for (int j = 0; j < steps; ++j) {
+					for (int j = 0; j <= steps; ++j) {
 						QPoint tp = quantize(cp, grid_step).toPoint() / grid_step + dp;
 						if (tp != qpt)
-							wavetrace.fill(tp, cs);
-						//qDebug() << " set" << cp;
+							wavetrace.fill(tp, (j > 0 && j < steps) ? cs : BlockViewWavetrace::Blocked);
+						//qDebug() << " set" << cp << ((j > 0 && j < steps) ? cs : BlockViewWavetrace::Blocked);
 						cp += QPointF(sx, sy);
 					}
 				}