diff --git a/repos/os/src/lib/sandbox/config_model.cc b/repos/os/src/lib/sandbox/config_model.cc
index 0dbb118276..fb17b53cb5 100644
--- a/repos/os/src/lib/sandbox/config_model.cc
+++ b/repos/os/src/lib/sandbox/config_model.cc
@@ -21,7 +21,7 @@ struct Config_model::Node : Noncopyable, Interface, private List_model<Node>::El
 	friend class List_model<Node>;
 	friend class List<Node>;
 
-	static bool type_matches(Xml_node const &) { return true; }
+	static bool type_matches(Xml_node const &xml);
 
 	virtual bool matches(Xml_node const &) const = 0;
 
@@ -304,6 +304,20 @@ struct Config_model::Service_node : Node
 };
 
 
+bool Config_model::Node::type_matches(Xml_node const &xml)
+{
+	return Parent_provides_node::type_matches(xml)
+	    || Default_route_node  ::type_matches(xml)
+	    || Default_node        ::type_matches(xml)
+	    || Start_node          ::type_matches(xml)
+	    || Affinity_space_node ::type_matches(xml)
+	    || Report_node         ::type_matches(xml)
+	    || Resource_node       ::type_matches(xml)
+	    || Heartbeat_node      ::type_matches(xml)
+	    || Service_node        ::type_matches(xml);
+}
+
+
 void Config_model::update_from_xml(Xml_node                 const &xml,
                                    Allocator                      &alloc,
                                    Reconstructible<Verbose>       &verbose,