diff --git a/gtk2_ardour/vst3_hwnd_plugin_ui.cc b/gtk2_ardour/vst3_hwnd_plugin_ui.cc
index 2e049a9086..5b1a0bae83 100644
--- a/gtk2_ardour/vst3_hwnd_plugin_ui.cc
+++ b/gtk2_ardour/vst3_hwnd_plugin_ui.cc
@@ -140,7 +140,8 @@ VST3HWNDPluginUI::on_window_show (const std::string& /*title*/)
 	}
 
 	gtk_widget_realize (GTK_WIDGET(_gui_widget.gobj()));
-	_gui_widget.show ();
+	_gui_widget.show_all ();
+	_gui_widget.queue_resize ();
 	return true;
 }
 
diff --git a/gtk2_ardour/vst3_nsview_plugin_ui.mm b/gtk2_ardour/vst3_nsview_plugin_ui.mm
index 9f77d2fe34..8498e5defa 100644
--- a/gtk2_ardour/vst3_nsview_plugin_ui.mm
+++ b/gtk2_ardour/vst3_nsview_plugin_ui.mm
@@ -209,6 +209,7 @@ VST3NSViewPluginUI::on_window_show (const std::string& /*title*/)
 {
 	gtk_widget_realize (GTK_WIDGET(_gui_widget.gobj()));
 	show_all ();
+	_gui_widget.queue_resize ();
 	return true;
 }
 
diff --git a/gtk2_ardour/vst3_x11_plugin_ui.cc b/gtk2_ardour/vst3_x11_plugin_ui.cc
index ecc4d6d749..54612c0e92 100644
--- a/gtk2_ardour/vst3_x11_plugin_ui.cc
+++ b/gtk2_ardour/vst3_x11_plugin_ui.cc
@@ -282,7 +282,8 @@ VST3X11PluginUI::on_window_show (const std::string& /*title*/)
 		return false;
 	}
 	gtk_widget_realize (GTK_WIDGET(_gui_widget.gobj()));
-	_gui_widget.show ();
+	_gui_widget.show_all ();
+	_gui_widget.queue_resize ();
 	return true;
 }