diff --git a/gtk2_ardour/audio_clip_editor.cc b/gtk2_ardour/audio_clip_editor.cc
index 9289ccdb47..48f58586c7 100644
--- a/gtk2_ardour/audio_clip_editor.cc
+++ b/gtk2_ardour/audio_clip_editor.cc
@@ -242,7 +242,6 @@ AudioClipEditor::build_canvas ()
 	_canvas.add_events (Gdk::POINTER_MOTION_HINT_MASK | Gdk::SCROLL_MASK | Gdk::KEY_PRESS_MASK | Gdk::KEY_RELEASE_MASK);
 	_canvas.set_can_focus ();
 	_canvas_viewport.signal_size_allocate().connect (sigc::mem_fun(*this, &AudioClipEditor::canvas_allocate), false);
-	_canvas_viewport.set_size_request (1, 1);
 
 	_toolbox.pack_start (_canvas_viewport, true, true);
 
diff --git a/gtk2_ardour/trigger_page.cc b/gtk2_ardour/trigger_page.cc
index fdd45f13a1..9749b65d16 100644
--- a/gtk2_ardour/trigger_page.cc
+++ b/gtk2_ardour/trigger_page.cc
@@ -147,6 +147,9 @@ TriggerPage::TriggerPage ()
 	_midi_editor = new Pianoroll (X_("MIDICueEditor"));
 	_audio_editor = new AudioClipEditor (X_("AudioClipEditor"));
 
+	_audio_editor->get_canvas_viewport()->set_size_request (1, 1);
+	_midi_editor->get_canvas_viewport()->set_size_request (1, 1);
+
 	_audio_editor->get_canvas_viewport()->show ();
 	_midi_editor->get_canvas_viewport()->show ();