diff --git a/gtk2_ardour/editor_summary.cc b/gtk2_ardour/editor_summary.cc
index 9acc8786d8..0a98190400 100644
--- a/gtk2_ardour/editor_summary.cc
+++ b/gtk2_ardour/editor_summary.cc
@@ -280,7 +280,7 @@ EditorSummary::render (Cairo::RefPtr<Cairo::Context> const& ctx, cairo_rectangle
 	}
 
 	int32_t width = _view_rectangle_x.second - _view_rectangle_x.first;
-	std::min(8, width);
+	width = std::min (8, width);
 	cairo_rectangle (cr, _view_rectangle_x.first, 0, width, get_height ());
 	cairo_set_source_rgba (cr, 1, 1, 1, 0.15);
 	cairo_fill (cr);