diff --git a/gtk2_ardour/vst3_hwnd_plugin_ui.cc b/gtk2_ardour/vst3_hwnd_plugin_ui.cc
index 01653d84d3..f711541b55 100644
--- a/gtk2_ardour/vst3_hwnd_plugin_ui.cc
+++ b/gtk2_ardour/vst3_hwnd_plugin_ui.cc
@@ -62,7 +62,7 @@ VST3HWNDPluginUI::view_realized ()
 	IPlugView* view = _vst3->view ();
 	HWND hwnd = (HWND) gdk_win32_drawable_get_handle (GTK_WIDGET(_gui_widget.gobj())->window);
 	// SetWindowLongPtr (hwnd, GWLP_USERDATA, (__int3264) (LONG_PTR)this);
-	if (kResultOk != view->attached (reinterpret_cast<void*> (hwnd), "HWND")) {
+	if (kResultOk != view->attached (reinterpret_cast<void*> (hwnd), Steinberg::kPlatformTypeHWND)) {
 		assert (0);
 	}
 
diff --git a/gtk2_ardour/vst3_nsview_plugin_ui.mm b/gtk2_ardour/vst3_nsview_plugin_ui.mm
index 8771026bc1..9f77d2fe34 100644
--- a/gtk2_ardour/vst3_nsview_plugin_ui.mm
+++ b/gtk2_ardour/vst3_nsview_plugin_ui.mm
@@ -76,7 +76,7 @@ VST3NSViewPluginUI::VST3NSViewPluginUI (boost::shared_ptr<PluginInsert> pi, boos
 		return;
 	}
 
-	if (kResultOk != view->attached (reinterpret_cast<void*> (_ns_view), "NSView")) {
+	if (kResultOk != view->attached (reinterpret_cast<void*> (_ns_view), Steinberg::kPlatformTypeNSView)) {
 		printf ("FAILED TO ATTACH..\n");
 	}
 
diff --git a/gtk2_ardour/vst3_x11_plugin_ui.cc b/gtk2_ardour/vst3_x11_plugin_ui.cc
index 2909767777..a926c864dd 100644
--- a/gtk2_ardour/vst3_x11_plugin_ui.cc
+++ b/gtk2_ardour/vst3_x11_plugin_ui.cc
@@ -200,7 +200,7 @@ VST3X11PluginUI::view_realized ()
 		return;
 	}
 	Window window = _gui_widget.get_id ();
-	if (kResultOk != view->attached (reinterpret_cast<void*> (window), "X11EmbedWindowID")) {
+	if (kResultOk != view->attached (reinterpret_cast<void*> (window), Steinberg::kPlatformTypeX11EmbedWindowID)) {
 		assert (0);
 	}
 #if 0