diff --git a/libs/ardour/ardour/directory_names.h b/libs/ardour/ardour/directory_names.h
index f55fc47c45..b927903e26 100644
--- a/libs/ardour/ardour/directory_names.h
+++ b/libs/ardour/ardour/directory_names.h
@@ -40,6 +40,7 @@ namespace ARDOUR {
 	LIBARDOUR_API extern const char* const export_formats_dir_name;
 	LIBARDOUR_API extern const char* const plugin_metadata_dir_name;
 	LIBARDOUR_API extern const char* const templates_dir_name;
+	LIBARDOUR_API extern const char* const routestates_dir_name;
 	LIBARDOUR_API extern const char* const route_templates_dir_name;
 	LIBARDOUR_API extern const char* const surfaces_dir_name;
 	LIBARDOUR_API extern const char* const theme_dir_name;
diff --git a/libs/ardour/ardour/filename_extensions.h b/libs/ardour/ardour/filename_extensions.h
index 4390527df6..2fdf7e04c7 100644
--- a/libs/ardour/ardour/filename_extensions.h
+++ b/libs/ardour/ardour/filename_extensions.h
@@ -38,5 +38,6 @@ namespace ARDOUR {
 	LIBARDOUR_API extern const char* const template_archive_suffix;
 	LIBARDOUR_API extern const char* const midi_map_suffix;
 	LIBARDOUR_API extern const char* const advanced_authoring_format_suffix;
+	LIBARDOUR_API extern const char* const routestate_suffix;
 }
 
diff --git a/libs/ardour/directory_names.cc b/libs/ardour/directory_names.cc
index 6a092001b6..8358ba4627 100644
--- a/libs/ardour/directory_names.cc
+++ b/libs/ardour/directory_names.cc
@@ -37,6 +37,7 @@ const char* const export_dir_name = X_("export");
 const char* const backup_dir_name = X_("backup");
 const char* const export_formats_dir_name = X_("export");
 const char* const templates_dir_name = X_("templates");
+const char* const routestates_dir_name = X_("routestates");
 const char* const plugin_metadata_dir_name = X_("plugin_metadata");
 const char* const route_templates_dir_name = X_("route_templates");
 const char* const surfaces_dir_name = X_("surfaces");
diff --git a/libs/ardour/filename_extensions.cc b/libs/ardour/filename_extensions.cc
index 505cbcc7be..984b787717 100644
--- a/libs/ardour/filename_extensions.cc
+++ b/libs/ardour/filename_extensions.cc
@@ -38,5 +38,6 @@ const char* const session_archive_suffix = X_(".ardour-session-archive");
 const char* const template_archive_suffix = X_(".ardour-template-archive");
 const char* const midi_map_suffix = X_(".map");
 const char* const advanced_authoring_format_suffix = X_(".aaf");
+const char* const routestate_suffix = X_(".routestate");
 
 }