diff --git a/libs/ardour/ardour/directory_names.h b/libs/ardour/ardour/directory_names.h
index 9f7c778d33..cb4701d336 100644
--- a/libs/ardour/ardour/directory_names.h
+++ b/libs/ardour/ardour/directory_names.h
@@ -36,6 +36,7 @@ extern const char* const export_formats_dir_name;
 extern const char* const templates_dir_name;
 extern const char* const route_templates_dir_name;
 extern const char* const surfaces_dir_name;
+extern const char* const ladspa_dir_name;
 extern const char* const user_config_dir_name;
 extern const char* const panner_dir_name;
 
diff --git a/libs/ardour/directory_names.cc b/libs/ardour/directory_names.cc
index 0632c6f8f2..6fb15eaabd 100644
--- a/libs/ardour/directory_names.cc
+++ b/libs/ardour/directory_names.cc
@@ -36,6 +36,7 @@ const char* const export_formats_dir_name = X_("export");
 const char* const templates_dir_name = X_("templates");
 const char* const route_templates_dir_name = X_("route_templates");
 const char* const surfaces_dir_name = X_("surfaces");
+const char* const ladspa_dir_name = X_("ladspa");
 const char* const panner_dir_name = X_("panners");
 
 /* these should end up using variants of PROGRAM_NAME */