diff --git a/libs/ardour/ardour/auv2_scan.h b/libs/ardour/ardour/auv2_scan.h
index 9101a36fa6..79b6c12eb8 100644
--- a/libs/ardour/ardour/auv2_scan.h
+++ b/libs/ardour/ardour/auv2_scan.h
@@ -74,15 +74,6 @@ public:
 	std::string manu;
 };
 
-LIBARDOUR_API extern void
-auv2_blacklist (std::string const&);
-
-LIBARDOUR_API extern void
-auv2_whitelist (std::string);
-
-LIBARDOUR_API extern bool
-auv2_is_blacklisted (std::string const&);
-
 LIBARDOUR_API extern std::string
 auv2_stringify_descriptor (CAComponentDescription const&);
 
diff --git a/libs/ardour/auv2_scan.cc b/libs/ardour/auv2_scan.cc
index 39e367c72d..6abf66360a 100644
--- a/libs/ardour/auv2_scan.cc
+++ b/libs/ardour/auv2_scan.cc
@@ -61,70 +61,6 @@
 using namespace std;
 using namespace PBD;
 
-void
-ARDOUR::auv2_blacklist (std::string const& id)
-{
-	string fn = Glib::build_filename (ARDOUR::user_cache_directory(), "au_blacklist.txt");
-	FILE* f = NULL;
-	if (! (f = g_fopen (fn.c_str (), "a"))) {
-		error << "Cannot append to AU blacklist for '" << id <<"'\n";
-		return;
-	}
-	assert (id.find ("\n") == string::npos);
-	fprintf (f, "%s\n", id.c_str ());
-	::fclose (f);
-}
-
-void
-ARDOUR::auv2_whitelist (std::string id)
-{
-	string fn = Glib::build_filename (ARDOUR::user_cache_directory(), "au_blacklist.txt");
-	if (!Glib::file_test (fn, Glib::FILE_TEST_EXISTS)) {
-		warning << _("Expected AUv2 Blacklist file does not exist.") << endmsg;
-		return;
-	}
-
-	std::string bl;
-	try {
-		bl = Glib::file_get_contents (fn);
-	} catch (Glib::FileError const& err) {
-		return;
-	}
-	::g_unlink (fn.c_str ());
-
-	assert (id.find("\n") == string::npos);
-
-	id += "\n"; // add separator
-	const size_t rpl = bl.find (id);
-	if (rpl != string::npos) {
-		bl.replace (rpl, id.size (), "");
-	}
-
-	if (bl.empty ()) {
-		return;
-	}
-	Glib::file_set_contents (fn, bl);
-}
-
-bool
-ARDOUR::auv2_is_blacklisted (std::string const& id)
-{
-	string fn = Glib::build_filename (ARDOUR::user_cache_directory(), "au_blacklist.txt");
-	if (!Glib::file_test (fn, Glib::FILE_TEST_EXISTS)) {
-		return false;
-	}
-
-	std::string bl;
-	try {
-		bl = Glib::file_get_contents (fn);
-	} catch (Glib::FileError const& err) {
-		return false;
-	}
-	return bl.find (id + "\n") != string::npos;
-}
-
-/* ****************************************************************************/
-
 ARDOUR::AUv2DescStr::AUv2DescStr (std::string const& desc)
 {
 	if (desc.empty ()) {
diff --git a/libs/ardour/plugin_manager.cc b/libs/ardour/plugin_manager.cc
index 690e02cd2e..5ebc7211d2 100644
--- a/libs/ardour/plugin_manager.cc
+++ b/libs/ardour/plugin_manager.cc
@@ -161,6 +161,8 @@ std::string PluginManager::vst3_scanner_bin_path = "";
 # endif
 #endif
 
+#define AUV2_BLACKLIST  "auv2_blacklist.txt"
+
 PluginManager&
 PluginManager::instance()
 {
@@ -704,7 +706,7 @@ void
 PluginManager::clear_au_blacklist ()
 {
 #ifdef AUDIOUNIT_SUPPORT
-	string fn = Glib::build_filename (ARDOUR::user_cache_directory(), "au_blacklist.txt");
+	string fn = Glib::build_filename (ARDOUR::user_cache_directory(), AUV2_BLACKLIST);
 	if (Glib::file_test (fn, Glib::FILE_TEST_EXISTS)) {
 		::g_unlink(fn.c_str());
 	}
@@ -1076,6 +1078,70 @@ PluginManager::lv2_refresh ()
 
 #ifdef AUDIOUNIT_SUPPORT
 
+static void
+auv2_blacklist (std::string const& id)
+{
+	string fn = Glib::build_filename (ARDOUR::user_cache_directory(), AUV2_BLACKLIST);
+	FILE* f = NULL;
+	if (! (f = g_fopen (fn.c_str (), "a"))) {
+		error << "Cannot append to AU blacklist for '" << id <<"'\n";
+		return;
+	}
+	assert (id.find ("\n") == string::npos);
+	fprintf (f, "%s\n", id.c_str ());
+	::fclose (f);
+}
+
+static void
+auv2_whitelist (std::string id)
+{
+	string fn = Glib::build_filename (ARDOUR::user_cache_directory(), AUV2_BLACKLIST);
+	if (!Glib::file_test (fn, Glib::FILE_TEST_EXISTS)) {
+		warning << _("Expected AUv2 Blacklist file does not exist.") << endmsg;
+		return;
+	}
+
+	std::string bl;
+	try {
+		bl = Glib::file_get_contents (fn);
+	} catch (Glib::FileError const& err) {
+		return;
+	}
+	::g_unlink (fn.c_str ());
+
+	assert (id.find("\n") == string::npos);
+
+	id += "\n"; // add separator
+	const size_t rpl = bl.find (id);
+	if (rpl != string::npos) {
+		bl.replace (rpl, id.size (), "");
+	}
+
+	if (bl.empty ()) {
+		return;
+	}
+	Glib::file_set_contents (fn, bl);
+}
+
+static bool
+auv2_is_blacklisted (std::string const& id)
+{
+	string fn = Glib::build_filename (ARDOUR::user_cache_directory(), AUV2_BLACKLIST);
+	if (!Glib::file_test (fn, Glib::FILE_TEST_EXISTS)) {
+		return false;
+	}
+
+	std::string bl;
+	try {
+		bl = Glib::file_get_contents (fn);
+	} catch (Glib::FileError const& err) {
+		return false;
+	}
+	return bl.find (id + "\n") != string::npos;
+}
+
+/* ****************************************************************************/
+
 static void auv2_scanner_log (std::string msg, PluginScanLogEntry* psle)
 {
 	psle->msg (PluginScanLogEntry::OK, msg);