diff --git a/libs/ardour/ardour/session.h b/libs/ardour/ardour/session.h
index ef0d5d9..50c4c22 100644
--- a/libs/ardour/ardour/session.h
+++ b/libs/ardour/ardour/session.h
@@ -193,7 +193,7 @@ class LIBARDOUR_API Session : public PBD::StatefulDestructible, public PBD::Scop
 	std::string peak_path (std::string) const;
 
 	std::string peak_path_from_audio_path (std::string) const;
-	bool audio_source_name_is_unique (const std::string& name, uint32_t chan);
+	bool audio_source_name_is_unique (const std::string& name);
 	std::string format_audio_source_name (const std::string& legalized_base, uint32_t nchan, uint32_t chan, bool destructive, bool take_required, uint32_t cnt, bool related_exists);
 	std::string new_audio_source_path_for_embedded (const std::string& existing_path);
 	std::string new_audio_source_path (const std::string&, uint32_t nchans, uint32_t chan, bool destructive, bool take_required);
diff --git a/libs/ardour/session.cc b/libs/ardour/session.cc
index 3bdee5d..1e1ea69 100644
--- a/libs/ardour/session.cc
+++ b/libs/ardour/session.cc
@@ -3639,7 +3639,7 @@ Session::new_audio_source_path_for_embedded (const std::string& path)
 }
 
 bool
-Session::audio_source_name_is_unique (const string& name, uint32_t chan)
+Session::audio_source_name_is_unique (const string& name)
 {
 	std::vector<string> sdirs = source_search_path (DataType::AUDIO);
 	vector<space_and_path>::iterator i;
@@ -3672,7 +3672,7 @@ Session::audio_source_name_is_unique (const string& name, uint32_t chan)
 		
 		string possible_path = Glib::build_filename (spath, name);
 
-		if (audio_source_by_path_and_channel (possible_path, chan)) {
+		if (audio_source_by_path_and_channel (possible_path, 0)) {
 			existing++;
 			break;
 		}
@@ -3740,7 +3740,7 @@ Session::new_audio_source_path (const string& base, uint32_t nchan, uint32_t cha
 
 		possible_name = format_audio_source_name (legalized, nchan, chan, destructive, take_required, cnt, some_related_source_name_exists);
 		
-		if (audio_source_name_is_unique (possible_name, chan)) {
+		if (audio_source_name_is_unique (possible_name)) {
 			break;
 		}