diff --git a/gtk2_ardour/vst3_hwnd_plugin_ui.cc b/gtk2_ardour/vst3_hwnd_plugin_ui.cc
index f711541b55..2e049a9086 100644
--- a/gtk2_ardour/vst3_hwnd_plugin_ui.cc
+++ b/gtk2_ardour/vst3_hwnd_plugin_ui.cc
@@ -71,6 +71,8 @@ VST3HWNDPluginUI::view_realized ()
 		_req_width  = rect.right - rect.left;
 		_req_height = rect.bottom - rect.top;
 	}
+
+	_gui_widget.queue_resize ();
 }
 
 void
diff --git a/gtk2_ardour/vst3_x11_plugin_ui.cc b/gtk2_ardour/vst3_x11_plugin_ui.cc
index a926c864dd..ecc4d6d749 100644
--- a/gtk2_ardour/vst3_x11_plugin_ui.cc
+++ b/gtk2_ardour/vst3_x11_plugin_ui.cc
@@ -214,6 +214,7 @@ VST3X11PluginUI::view_realized ()
 		_req_width  = rect.right - rect.left;
 		_req_height = rect.bottom - rect.top;
 	}
+	_gui_widget.queue_resize ();
 }
 
 void