diff --git a/gtk2_ardour/streamview.cc b/gtk2_ardour/streamview.cc
index d77681b6d5..692d1a1e57 100644
--- a/gtk2_ardour/streamview.cc
+++ b/gtk2_ardour/streamview.cc
@@ -158,6 +158,8 @@ StreamView::set_samples_per_unit (gdouble spp)
 		recbox.rectangle->property_x2() = xend;
 	}
 
+	update_coverage_frames ();
+
 	return 0;
 }