diff --git a/gtk2_ardour/ardour_ui_options.cc b/gtk2_ardour/ardour_ui_options.cc
index ca11d4a4d9..884ad008ca 100644
--- a/gtk2_ardour/ardour_ui_options.cc
+++ b/gtk2_ardour/ardour_ui_options.cc
@@ -744,6 +744,8 @@ ARDOUR_UI::set_meter_falloff (MeterFalloff val)
 void
 ARDOUR_UI::parameter_changed (const char* parameter_name)
 {
+	ENSURE_GUI_THREAD (bind (mem_fun (*this, &ARDOUR_UI::parameter_changed), parameter_name));
+
 #define PARAM_IS(x) (!strcmp (parameter_name, (x)))
 	
 	if (PARAM_IS ("slave-source")) {
diff --git a/svn_revision.h b/svn_revision.h
index cddf78e774..13a16de743 100644
--- a/svn_revision.h
+++ b/svn_revision.h
@@ -1,4 +1,4 @@
 #ifndef __ardour_svn_revision_h__
 #define __ardour_svn_revision_h__
-static const char* ardour_svn_revision = "1266";
+static const char* ardour_svn_revision = "1341";
 #endif