diff --git a/libs/ardour/ardour/debug.h b/libs/ardour/ardour/debug.h
index ff1f2c6805..c688748231 100644
--- a/libs/ardour/ardour/debug.h
+++ b/libs/ardour/ardour/debug.h
@@ -86,6 +86,7 @@ namespace PBD {
 		LIBARDOUR_API extern DebugBits CC121;
 		LIBARDOUR_API extern DebugBits VCA;
 		LIBARDOUR_API extern DebugBits Push2;
+		LIBARDOUR_API extern DebugBits US2400;
 
 	}
 }
diff --git a/libs/ardour/debug.cc b/libs/ardour/debug.cc
index 77b46bcec3..2ac53dab51 100644
--- a/libs/ardour/debug.cc
+++ b/libs/ardour/debug.cc
@@ -83,3 +83,4 @@ PBD::DebugBits PBD::DEBUG::FaderPort8 = PBD::new_debug_bit ("faderport8");
 PBD::DebugBits PBD::DEBUG::CC121 = PBD::new_debug_bit ("cc121");
 PBD::DebugBits PBD::DEBUG::VCA = PBD::new_debug_bit ("vca");
 PBD::DebugBits PBD::DEBUG::Push2 = PBD::new_debug_bit ("push2");
+PBD::DebugBits PBD::DEBUG::US2400 = PBD::new_debug_bit ("us2400");