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diff --git a/src/engine/events/PingQueuedEvent.hpp b/src/engine/events/PingQueuedEvent.hpp
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+++ b/src/engine/events/PingQueuedEvent.hpp
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+/* This file is part of Ingen.
+ * Copyright (C) 2007 Dave Robillard <http://drobilla.net>
+ * 
+ * Ingen is free software; you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation; either version 2 of the License, or (at your option) any later
+ * version.
+ * 
+ * Ingen is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
+ * 
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef PINGQUEUEDEVENT_H
+#define PINGQUEUEDEVENT_H
+
+#include "QueuedEvent.hpp"
+#include "types.hpp"
+#include "Responder.hpp"
+
+namespace Ingen {
+
+class PortImpl;
+
+
+/** A ping that travels through the pre-processed event queue before responding
+ * (useful for the order guarantee).
+ *
+ * \ingroup engine
+ */
+class PingQueuedEvent : public QueuedEvent
+{
+public:
+	PingQueuedEvent(Engine& engine, SharedPtr<Responder> responder, SampleCount timestamp)
+		: QueuedEvent(engine, responder, timestamp)
+	{}
+
+	void post_process() { _responder->respond_ok(); }
+};
+
+
+} // namespace Ingen
+
+#endif // PINGQUEUEDEVENT_H