diff --git a/gtk2_ardour/plugin_ui.cc b/gtk2_ardour/plugin_ui.cc
index c71fd1980d..9774d3dc46 100644
--- a/gtk2_ardour/plugin_ui.cc
+++ b/gtk2_ardour/plugin_ui.cc
@@ -313,13 +313,13 @@ PluginUIWindow::create_lxvst_editor(boost::shared_ptr<PluginInsert>)
 }
 
 bool
-#ifdef GTKOSX
+#ifdef AUDIOUNIT_SUPPORT
 PluginUIWindow::create_audiounit_editor (boost::shared_ptr<PluginInsert> insert)
 #else
 PluginUIWindow::create_audiounit_editor (boost::shared_ptr<PluginInsert>)
 #endif
 {
-#ifndef GTKOSX
+#ifndef AUDIOUNIT_SUPPORT
 	return false;
 #else
 	VBox* box;
@@ -340,7 +340,7 @@ PluginUIWindow::app_activated (bool yn)
 PluginUIWindow::app_activated (bool)
 #endif
 {
-#ifdef GTKOSX
+#ifdef AUDIOUNIT_SUPPORT
 	if (_pluginui) {
 		if (yn) {
 			if (was_visible) {
diff --git a/gtk2_ardour/wscript b/gtk2_ardour/wscript
index 3a5a301a13..358f17854f 100644
--- a/gtk2_ardour/wscript
+++ b/gtk2_ardour/wscript
@@ -411,9 +411,12 @@ def build(bld):
 
     if bld.is_defined('HAVE_COREAUDIO'):
         TaskGen.task_gen.mappings['.mm'] = TaskGen.task_gen.mappings['.cc']
-        obj.source += [ 'cocoacarbon.mm', 'au_pluginui.mm' ]
+        obj.source += [ 'cocoacarbon.mm' ]
         obj.use += ' libappleutility '
 
+    if bld.is_defined('AUDIOUNIT_SUPPORT'):
+        obj.source += [ 'au_pluginui.mm' ]
+
     if bld.is_defined('WINDOWS_VST_SUPPORT'):
         # If we require VST support we build a stub main() and the FST library
         # here using winegcc, and link it to the GTK front-end library
diff --git a/libs/ardour/wscript b/libs/ardour/wscript
index ee5f209129..dfdb4a47ca 100644
--- a/libs/ardour/wscript
+++ b/libs/ardour/wscript
@@ -398,6 +398,8 @@ def build(bld):
     if bld.is_defined('HAVE_COREAUDIO'):
         obj.source += [ 'coreaudiosource.cc', 'caimportable.cc' ]
         obj.use    += ['libappleutility']
+
+    if bld.is_defined('AUDIOUNIT_SUPPORT'):
         obj.source += [ 'audio_unit.cc' ]
 
     if Options.options.fpu_optimization: