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diff --git a/src/messages/MNop.h b/src/messages/MNop.h
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+++ b/src/messages/MNop.h
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+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+/*
+ * Ceph - scalable distributed file system
+ *
+ * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net>
+ * Portions Copyright (C) 2014 CohortFS, LLC
+ *
+ * This is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License version 2.1, as published by the Free Software
+ * Foundation.  See file COPYING.
+ *
+ */
+
+#ifndef CEPH_MSG_NOP_H
+#define CEPH_MSG_NOP_H
+
+#include "msg/Message.h"
+#include "msg/msg_types.h"
+
+/*
+ * A message with no (remote) effect.
+ */
+class MNop : public MessageInstance<MNop> {
+public:
+  friend factory;
+
+  static constexpr int HEAD_VERSION = 1;
+  static constexpr int COMPAT_VERSION = 1;
+
+  __u32 tag; // ignored tag value
+
+  MNop()
+    : MessageInstance(MSG_NOP, HEAD_VERSION, COMPAT_VERSION)
+    {}
+
+  ~MNop() {}
+
+  void encode_payload(uint64_t _features) {
+    using ceph::encode;
+    encode(tag, payload);
+  }
+
+  void decode_payload() {
+    auto p = payload.cbegin();
+    decode(tag, p);
+  }
+
+  std::string_view get_type_name() const { return "MNop"; }
+
+  void print(ostream& out) const {
+    out << get_type_name() << " ";
+  }
+}; /* MNop */
+
+#endif /* CEPH_MSG_NOP_H */