diff --git a/libs/ardour/solo_isolate_control.cc b/libs/ardour/solo_isolate_control.cc
index c2d7f13d2c..90132a951c 100644
--- a/libs/ardour/solo_isolate_control.cc
+++ b/libs/ardour/solo_isolate_control.cc
@@ -159,12 +159,7 @@ SoloIsolateControl::set_state (XMLNode const & node, int version)
 		return -1;
 	}
 
-	XMLProperty const * prop;
-
-	if ((prop = node.property ("solo-isolated")) != 0) {
-		_solo_isolated = string_is_affirmative (prop->value());
-	}
-
+	node.get_property ("solo-isolated", _solo_isolated);
 	return 0;
 }
 
@@ -172,6 +167,6 @@ XMLNode&
 SoloIsolateControl::get_state ()
 {
 	XMLNode& node (SlavableAutomationControl::get_state());
-	node.add_property (X_("solo-isolated"), _solo_isolated ? X_("yes") : X_("no"));
+	node.set_property (X_("solo-isolated"), _solo_isolated);
 	return node;
 }