diff --git a/libs/ardour/ardour/session_handle.h b/libs/ardour/ardour/session_handle.h
index 0c660ca054..1298373499 100644
--- a/libs/ardour/ardour/session_handle.h
+++ b/libs/ardour/ardour/session_handle.h
@@ -46,7 +46,7 @@ class LIBARDOUR_API SessionHandlePtr
 {
 public:
 	SessionHandlePtr (ARDOUR::Session* s);
-	SessionHandlePtr () : _session (0) {}
+	SessionHandlePtr ();
 	virtual ~SessionHandlePtr () {}
 
 	virtual void set_session (ARDOUR::Session *);
diff --git a/libs/ardour/session_handle.cc b/libs/ardour/session_handle.cc
index 8a0f246a26..7777e3aaa0 100644
--- a/libs/ardour/session_handle.cc
+++ b/libs/ardour/session_handle.cc
@@ -34,6 +34,14 @@ using namespace std;
 using namespace ARDOUR;
 using namespace PBD;
 
+SessionHandlePtr::SessionHandlePtr ()
+	: _session (0)
+#ifdef TRACE_SETSESSION_NULL
+	, _gone_away_emitted (false)
+#endif
+{
+}
+
 SessionHandlePtr::SessionHandlePtr (Session* s)
 	: _session (s)
 #ifdef TRACE_SETSESSION_NULL