diff --git a/spectrum/src/frontends/xmpp/BlockSerializer.cpp b/spectrum/src/frontends/xmpp/BlockSerializer.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..8cbc02b7b38a0453310a48afe8365d155c9b2359
--- /dev/null
+++ b/spectrum/src/frontends/xmpp/BlockSerializer.cpp
@@ -0,0 +1,28 @@
+/*
+ * Copyright (c) 2011 Jan Kaluza
+ * Licensed under the Simplified BSD license.
+ * See Documentation/Licenses/BSD-simplified.txt for more information.
+ */
+
+#include <BlockSerializer.h>
+
+#include <boost/shared_ptr.hpp>
+
+#include <Swiften/Serializer/XML/XMLTextNode.h>
+#include <Swiften/Serializer/XML/XMLRawTextNode.h>
+#include <Swiften/Serializer/XML/XMLElement.h>
+
+namespace Transport {
+
+// This payload is NOT part of ANY XEP and it is only
+// libtransport related extension.
+BlockSerializer::BlockSerializer() : Swift::GenericPayloadSerializer<BlockPayload>() {
+}
+
+std::string BlockSerializer::serializePayload(boost::shared_ptr<BlockPayload> attention)  const {
+	Swift::XMLElement attentionElement("block", "urn:xmpp:block:0");
+
+	return attentionElement.serialize();
+}
+
+}