diff --git a/libs/ardour/plugin_manager.cc b/libs/ardour/plugin_manager.cc
index 89ddc5ff19..5f8ad720c4 100644
--- a/libs/ardour/plugin_manager.cc
+++ b/libs/ardour/plugin_manager.cc
@@ -438,7 +438,7 @@ PluginManager::clear_au_cache ()
 {
 #ifdef AUDIOUNIT_SUPPORT
 	// AUPluginInfo::au_cache_path ()
-	string fn = Glib::build_filename (ARDOUR::user_config_directory(), "au_cache");
+	string fn = Glib::build_filename (ARDOUR::user_cache_directory(), "au_cache");
 	if (Glib::file_test (fn, Glib::FILE_TEST_EXISTS)) {
 		::g_unlink(fn.c_str());
 	}