diff --git a/libs/ardour/ardour/readonly_control.h b/libs/ardour/ardour/readonly_control.h
index c5a76ed373..2c379e64d7 100644
--- a/libs/ardour/ardour/readonly_control.h
+++ b/libs/ardour/ardour/readonly_control.h
@@ -20,6 +20,10 @@
 #define __ardour_readonly_control_h__
 
 #include <boost/weak_ptr.hpp>
+
+#include "pbd/destructible.h"
+
+#include "ardour/libardour_visibility.h"
 #include "ardour/parameter_descriptor.h"
 
 namespace ARDOUR {