diff --git a/gtk2_ardour/vst3_hwnd_plugin_ui.cc b/gtk2_ardour/vst3_hwnd_plugin_ui.cc
index a9841ab5ab..ab7868e8f7 100644
--- a/gtk2_ardour/vst3_hwnd_plugin_ui.cc
+++ b/gtk2_ardour/vst3_hwnd_plugin_ui.cc
@@ -94,7 +94,9 @@ VST3HWNDPluginUI::view_size_allocate (Gtk::Allocation& allocation)
 	}
 	PBD::Unwinder<bool> uw (_resize_in_progress, true);
 	ViewRect rect;
-	if (view->getSize (&rect) == kResultOk) {
+	if (view->getSize (&rect) == kResultOk
+	    && ! (rect.right - rect.left == allocation.get_width () && rect.bottom - rect.top ==  allocation.get_height ()))
+	{
 		rect.right = rect.left + allocation.get_width ();
 		rect.bottom = rect.top + allocation.get_height ();
 #if 0
diff --git a/gtk2_ardour/vst3_nsview_plugin_ui.mm b/gtk2_ardour/vst3_nsview_plugin_ui.mm
index 4c685e8005..b5b665ba09 100644
--- a/gtk2_ardour/vst3_nsview_plugin_ui.mm
+++ b/gtk2_ardour/vst3_nsview_plugin_ui.mm
@@ -122,7 +122,9 @@ VST3NSViewPluginUI::view_size_allocate (Gtk::Allocation& allocation)
 	PBD::Unwinder<bool> uw (_resize_in_progress, true);
 
 	ViewRect rect;
-	if (view->getSize (&rect) == kResultOk) {
+	if (view->getSize (&rect) == kResultOk
+	    && !(rect.right - rect.left == allocation.get_width () && rect.bottom - rect.top ==  allocation.get_height () && rect.left == xx && rect.top == yy))
+	{
 		rect.left   = xx;
 		rect.top    = yy;
 		rect.right  = rect.left + allocation.get_width ();
diff --git a/gtk2_ardour/vst3_x11_plugin_ui.cc b/gtk2_ardour/vst3_x11_plugin_ui.cc
index c7a20b9ec3..3dbc611100 100644
--- a/gtk2_ardour/vst3_x11_plugin_ui.cc
+++ b/gtk2_ardour/vst3_x11_plugin_ui.cc
@@ -247,7 +247,9 @@ VST3X11PluginUI::view_size_allocate (Gtk::Allocation& allocation)
 	PBD::Unwinder<bool> uw (_resize_in_progress, true);
 
 	ViewRect rect;
-	if (view->getSize (&rect) == kResultOk) {
+	if (view->getSize (&rect) == kResultOk
+	    && ! (rect.right - rect.left == allocation.get_width () && rect.bottom - rect.top ==  allocation.get_height ()))
+	{
 		rect.right = rect.left + allocation.get_width ();
 		rect.bottom = rect.top + allocation.get_height ();
 #if 0