diff --git a/libs/ardour/ardour/session.h b/libs/ardour/ardour/session.h
index 50c4c229ea..7d2908a18c 100644
--- a/libs/ardour/ardour/session.h
+++ b/libs/ardour/ardour/session.h
@@ -716,12 +716,11 @@ class LIBARDOUR_API Session : public PBD::StatefulDestructible, public PBD::Scop
 
 	/* I/O bundles */
 
-	void add_bundle (boost::shared_ptr<Bundle>);
+	void add_bundle (boost::shared_ptr<Bundle>, bool emit_signal = true);
 	void remove_bundle (boost::shared_ptr<Bundle>);
 	boost::shared_ptr<Bundle> bundle_by_name (std::string) const;
 
-	PBD::Signal1<void,boost::shared_ptr<Bundle> > BundleAdded;
-	PBD::Signal1<void,boost::shared_ptr<Bundle> > BundleRemoved;
+	PBD::Signal0<void> BundleAddedOrRemoved;
 
 	void midi_panic ();
 
diff --git a/libs/ardour/session.cc b/libs/ardour/session.cc
index b18b756e60..97346e44e7 100644
--- a/libs/ardour/session.cc
+++ b/libs/ardour/session.cc
@@ -4129,7 +4129,7 @@ Session::available_capture_duration ()
 }
 
 void
-Session::add_bundle (boost::shared_ptr<Bundle> bundle)
+Session::add_bundle (boost::shared_ptr<Bundle> bundle, bool emit_signal)
 {
 	{
 		RCUWriter<BundleList> writer (_bundles);
@@ -4137,7 +4137,9 @@ Session::add_bundle (boost::shared_ptr<Bundle> bundle)
 		b->push_back (bundle);
 	}
 
-	BundleAdded (bundle); /* EMIT SIGNAL */
+	if (emit_signal) {
+		BundleAddedOrRemoved (); /* EMIT SIGNAL */
+	}
 
 	set_dirty();
 }
@@ -4159,7 +4161,7 @@ Session::remove_bundle (boost::shared_ptr<Bundle> bundle)
 	}
 
 	if (removed) {
-		 BundleRemoved (bundle); /* EMIT SIGNAL */
+		 BundleAddedOrRemoved (); /* EMIT SIGNAL */
 	}
 
 	set_dirty();