diff --git a/gtk2_ardour/plugin_manager_ui.cc b/gtk2_ardour/plugin_manager_ui.cc
index a3715e8aab..9ce3466f75 100644
--- a/gtk2_ardour/plugin_manager_ui.cc
+++ b/gtk2_ardour/plugin_manager_ui.cc
@@ -49,6 +49,7 @@ using namespace ARDOUR_PLUGIN_UTILS;
 
 PluginManagerUI::PluginManagerUI ()
 	: ArdourWindow (_("Plugin Manager"))
+	, _btn_reindex (_("Update Index Only"))
 	, _btn_rescan_all (_("Re-scan All"))
 	, _btn_rescan_err (_("Re-scan Faulty"))
 	, _btn_rescan_sel (_("Re-scan Selected"))
@@ -187,6 +188,7 @@ PluginManagerUI::PluginManagerUI ()
 	b_actions->pack_start (_btn_rescan_sel);
 	b_actions->pack_start (_btn_rescan_err);
 	b_actions->pack_start (_btn_rescan_all);
+	b_actions->pack_start (_btn_reindex);
 	b_actions->set_spacing (4);
 	b_actions->set_border_width (4);
 
@@ -254,6 +256,7 @@ PluginManagerUI::PluginManagerUI ()
 
 	/* tooltips */
 	/* clang-format off */
+	ArdourWidgets::set_tooltip (_btn_reindex,    _("Only update plugin index, do not discover new plugins."));
 	ArdourWidgets::set_tooltip (_btn_rescan_all, _("Scans all plugins, regardless if they have already been successfully scanned\n.Depending on the number of plugins installed this can take a long time."));
 	ArdourWidgets::set_tooltip (_btn_rescan_err, _("Scans plugins that have not yet been successfully scanned."));
 	ArdourWidgets::set_tooltip (_btn_rescan_sel, _("Scans the selected plugin."));
@@ -290,6 +293,7 @@ PluginManagerUI::PluginManagerUI ()
 	PluginManager::instance ().PluginScanLogChanged.connect (_manager_connections, invalidator (*this), boost::bind (&PluginManagerUI::refill, this), gui_context ());
 	PluginManager::instance ().PluginStatusChanged.connect (_manager_connections, invalidator (*this), boost::bind (&PluginManagerUI::plugin_status_changed, this, _1, _2, _3), gui_context ());
 
+	_btn_reindex.signal_clicked.connect (sigc::mem_fun (*this, &PluginManagerUI::reindex));
 	_btn_rescan_all.signal_clicked.connect (sigc::mem_fun (*this, &PluginManagerUI::rescan_all));
 	_btn_rescan_err.signal_clicked.connect (sigc::mem_fun (*this, &PluginManagerUI::rescan_faulty));
 	_btn_rescan_sel.signal_clicked.connect (sigc::mem_fun (*this, &PluginManagerUI::rescan_selected));
@@ -805,6 +809,13 @@ PluginManagerUI::rescan_faulty ()
 	_entry_search.set_text ("");
 }
 
+void
+PluginManagerUI::reindex()
+{
+	PluginScanDialog psd (true, true, this);
+	psd.start ();
+}
+
 void
 PluginManagerUI::rescan_selected ()
 {
diff --git a/gtk2_ardour/plugin_manager_ui.h b/gtk2_ardour/plugin_manager_ui.h
index 498eb874a4..e9871b1a83 100644
--- a/gtk2_ardour/plugin_manager_ui.h
+++ b/gtk2_ardour/plugin_manager_ui.h
@@ -52,6 +52,7 @@ private:
 	void hidden_changed (std::string const&);
 	void row_activated (Gtk::TreeModel::Path const&, Gtk::TreeViewColumn*);
 
+	void reindex ();
 	void rescan_all ();
 	void rescan_faulty ();
 	void rescan_selected ();
@@ -121,6 +122,7 @@ private:
 	Gtk::TextView                _log;
 	Gtk::ScrolledWindow          _log_scroller;
 	ArdourWidgets::VPane         _pane;
+	ArdourWidgets::ArdourButton  _btn_reindex;
 	ArdourWidgets::ArdourButton  _btn_rescan_all;
 	ArdourWidgets::ArdourButton  _btn_rescan_err;
 	ArdourWidgets::ArdourButton  _btn_rescan_sel;