diff --git a/libs/ardour/audio_unit.cc b/libs/ardour/audio_unit.cc
index 0b3d83a3b9..5a0be032ce 100644
--- a/libs/ardour/audio_unit.cc
+++ b/libs/ardour/audio_unit.cc
@@ -600,7 +600,7 @@ AUPlugin::init ()
 
 	// Plugin::setup_controls ();
 
-	au_blacklist(CFStringRefToStdString(itemName));
+	au_unblacklist(CFStringRefToStdString(itemName));
 	if (itemName != NULL) CFRelease(itemName);
 }