diff --git a/gtk2_ardour/route_ui.cc b/gtk2_ardour/route_ui.cc
index 863f74c23a..2f2b4a3c3d 100644
--- a/gtk2_ardour/route_ui.cc
+++ b/gtk2_ardour/route_ui.cc
@@ -114,7 +114,7 @@ RouteUI::delete_ioselector (IOSelectorMap& m, boost::shared_ptr<ARDOUR::Route> r
 	if (!r) {
 		return;
 	}
-	IOSelectorMap::const_iterator i = m.find (r->id ());
+	IOSelectorMap::iterator i = m.find (r->id ());
 	if (i != m.end ()) {
 		delete i->second;
 		m.erase (i);