diff --git a/libs/surfaces/osc/osc_controllable.cc b/libs/surfaces/osc/osc_controllable.cc
index 4e6aa3b078..23bc4a79fb 100644
--- a/libs/surfaces/osc/osc_controllable.cc
+++ b/libs/surfaces/osc/osc_controllable.cc
@@ -27,7 +27,6 @@
 #include "osc.h"
 #include "osc_controllable.h"
 
-using namespace sigc;
 using namespace PBD;
 using namespace ARDOUR;
 using namespace ArdourSurface;