1 files changed, 1 insertions, 1 deletions
diff --git a/libs/surfaces/control_protocol/control_protocol/control_protocol.h b/libs/surfaces/control_protocol/control_protocol/control_protocol.h
index b787aeeb8f..7de1054ad2 100644
--- a/libs/surfaces/control_protocol/control_protocol/control_protocol.h
+++ b/libs/surfaces/control_protocol/control_protocol/control_protocol.h
@@ -34,7 +34,7 @@ namespace ARDOUR {
 class Route;
 class Session;
 
-class ControlProtocol : public sigc::trackable, public Stateful, public BasicUI {
+class ControlProtocol : public sigc::trackable, public PBD::Stateful, public BasicUI {
   public:
 	ControlProtocol (Session&, std::string name);
 	virtual ~ControlProtocol();