diff --git a/gtk2_ardour/pianoroll_window.cc b/gtk2_ardour/pianoroll_window.cc
index 826d40e6e9..867b3aa0a9 100644
--- a/gtk2_ardour/pianoroll_window.cc
+++ b/gtk2_ardour/pianoroll_window.cc
@@ -36,7 +36,7 @@ PianorollWindow::PianorollWindow (std::string const & name, Session& s)
 	, region_editor (nullptr)
 {
 	pianoroll->set_session (&s);
-	pianoroll->get_canvas_viewport()->set_size_request (600, 120);
+	pianoroll->get_canvas_viewport()->set_size_request (1270, 700);
 
 	add (hpacker);
 	hpacker.show ();