diff --git a/libs/ardour/ardour/coreaudiosource.h b/libs/ardour/ardour/coreaudiosource.h
index 6aa3722ed7..49009caf53 100644
--- a/libs/ardour/ardour/coreaudiosource.h
+++ b/libs/ardour/ardour/coreaudiosource.h
@@ -28,8 +28,8 @@ namespace ARDOUR {
 
 class CoreAudioSource : public AudioFileSource {
   public:
-	CoreAudioSource (const XMLNode&);
-	CoreAudioSource (const string& path_plus_channel, Flag);
+	CoreAudioSource (ARDOUR::Session&, const XMLNode&);
+	CoreAudioSource (ARDOUR::Session&, const string& path_plus_channel, Flag);
 	~CoreAudioSource ();
 
 	float sample_rate() const;
diff --git a/libs/ardour/coreaudiosource.cc b/libs/ardour/coreaudiosource.cc
index fa22dde347..049b5aabbe 100644
--- a/libs/ardour/coreaudiosource.cc
+++ b/libs/ardour/coreaudiosource.cc
@@ -30,14 +30,14 @@
 using namespace ARDOUR;
 using namespace PBD;
 
-CoreAudioSource::CoreAudioSource (const XMLNode& node)
-	: AudioFileSource (node)
+CoreAudioSource::CoreAudioSource (Session& s, const XMLNode& node)
+	: AudioFileSource (s, node)
 {
 	init (_name);
 }
 
-CoreAudioSource::CoreAudioSource (const string& idstr, Flag flags)
-	: AudioFileSource(idstr, flags)
+CoreAudioSource::CoreAudioSource (Session& s, const string& idstr, Flag flags)
+	: AudioFileSource(s, idstr, flags)
 {
 	init (idstr);
 }