diff --git a/src/messages/MOSDPGMissing.h b/src/messages/MOSDPGMissing.h
deleted file mode 100644
index b931b36353f..00000000000
--- a/src/messages/MOSDPGMissing.h
+++ /dev/null
@@ -1,57 +0,0 @@
-// -*- 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) 2010 Dreamhost
- *
- * 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_MOSDPGMISSING_H
-#define CEPH_MOSDPGMISSING_H
-
-#include "msg/Message.h"
-
-class MOSDPGMissing : public Message {
-  epoch_t epoch;
-
-public:
-  pg_info_t info;
-  pg_missing_t missing;
-
-  epoch_t get_epoch() { return epoch; }
-
-  MOSDPGMissing() : Message(MSG_OSD_PG_MISSING) {}
-  MOSDPGMissing(version_t mv, const pg_info_t &info_,
-		const pg_missing_t &missing_)
-    : Message(MSG_OSD_PG_MISSING), epoch(mv), info(info_),
-      missing(missing_) { }
-private:
-  ~MOSDPGMissing() {}
-
-public:
-  const char *get_type_name() const { return "pg_missing"; }
-  void print(ostream& out) const {
-    out << "pg_missing(" << info.pgid << " e" << epoch << ")";
-  }
-
-  void encode_payload(uint64_t features) {
-    ::encode(epoch, payload);
-    ::encode(info, payload);
-    ::encode(missing, payload);
-  }
-  void decode_payload() {
-    bufferlist::iterator p = payload.begin();
-    ::decode(epoch, p);
-    ::decode(info, p);
-    missing.decode(p, info.pgid.pool());
-  }
-};
-
-#endif
diff --git a/src/msg/Message.cc b/src/msg/Message.cc
index a226ecbca72..26c91eef093 100644
--- a/src/msg/Message.cc
+++ b/src/msg/Message.cc
@@ -77,7 +77,6 @@ using namespace std;
 #include "messages/MOSDPGInfo.h"
 #include "messages/MOSDPGCreate.h"
 #include "messages/MOSDPGTrim.h"
-#include "messages/MOSDPGMissing.h"
 #include "messages/MOSDScrub.h"
 #include "messages/MOSDRepScrub.h"
 #include "messages/MOSDPGScan.h"
@@ -501,9 +500,6 @@ Message *decode_message(CephContext *cct, int crcflags,
   case MSG_REMOVE_SNAPS:
     m = new MRemoveSnaps;
     break;
-  case MSG_OSD_PG_MISSING:
-    m = new MOSDPGMissing;
-    break;
   case MSG_OSD_REP_SCRUB:
     m = new MOSDRepScrub;
     break;
diff --git a/src/msg/Message.h b/src/msg/Message.h
index 680f4a0aeae..e103f793668 100644
--- a/src/msg/Message.h
+++ b/src/msg/Message.h
@@ -85,7 +85,7 @@
 #define MSG_REMOVE_SNAPS       90
 
 #define MSG_OSD_SCRUB          91
-#define MSG_OSD_PG_MISSING     92
+//#define MSG_OSD_PG_MISSING     92  // obsolete
 #define MSG_OSD_REP_SCRUB      93
 
 #define MSG_OSD_PG_SCAN        94
diff --git a/src/osd/OSD.cc b/src/osd/OSD.cc
index c645424ec1f..5cc7eca5390 100644
--- a/src/osd/OSD.cc
+++ b/src/osd/OSD.cc
@@ -85,7 +85,6 @@
 #include "messages/MOSDPGTrim.h"
 #include "messages/MOSDPGScan.h"
 #include "messages/MOSDPGBackfill.h"
-#include "messages/MOSDPGMissing.h"
 #include "messages/MBackfillReserve.h"
 #include "messages/MRecoveryReserve.h"
 #include "messages/MOSDECSubOpWrite.h"
@@ -6384,11 +6383,6 @@ void OSD::dispatch_op(OpRequestRef op)
   case MSG_OSD_PG_TRIM:
     handle_pg_trim(op);
     break;
-  case MSG_OSD_PG_MISSING:
-    assert(0 ==
-	   "received MOSDPGMissing; this message is supposed to be unused!?!");
-    break;
-
   case MSG_OSD_BACKFILL_RESERVE:
     handle_pg_backfill_reserve(op);
     break;
diff --git a/src/osd/OSD.h b/src/osd/OSD.h
index c0081b07835..3beb717e419 100644
--- a/src/osd/OSD.h
+++ b/src/osd/OSD.h
@@ -213,7 +213,6 @@ class ObjectStore;
 class FuseStore;
 class OSDMap;
 class MLog;
-class MOSDPGMissing;
 class Objecter;
 
 class Watch;
diff --git a/src/test/encoding/types.h b/src/test/encoding/types.h
index c0d43b9d46a..3616f88233e 100644
--- a/src/test/encoding/types.h
+++ b/src/test/encoding/types.h
@@ -558,8 +558,6 @@ MESSAGE(MOSDPGCreate)
 MESSAGE(MOSDPGInfo)
 #include "messages/MOSDPGLog.h"
 MESSAGE(MOSDPGLog)
-#include "messages/MOSDPGMissing.h"
-MESSAGE(MOSDPGMissing)
 #include "messages/MOSDPGNotify.h"
 MESSAGE(MOSDPGNotify)
 #include "messages/MOSDPGQuery.h"