diff --git a/libs/ardour/ardour/session_directory.h b/libs/ardour/ardour/session_directory.h
index 93340a991a..06fa52a53b 100644
--- a/libs/ardour/ardour/session_directory.h
+++ b/libs/ardour/ardour/session_directory.h
@@ -37,7 +37,7 @@ public:
 	/**
 	 * @param session_path An absolute path to a session directory.
 	 */
-	SessionDirectory (const string& session_path);
+	SessionDirectory (const path& session_path);
 
 	/**
 	 * @return the absolute path to the root directory of the session
diff --git a/libs/ardour/session_directory.cc b/libs/ardour/session_directory.cc
index 99a252ecb5..ee5af0adf4 100644
--- a/libs/ardour/session_directory.cc
+++ b/libs/ardour/session_directory.cc
@@ -34,7 +34,7 @@ namespace ARDOUR {
 
 using namespace PBD::sys;
 
-SessionDirectory::SessionDirectory (const string& session_path)
+SessionDirectory::SessionDirectory (const path& session_path)
 	: m_root_path(session_path)
 {