diff --git a/src/osd/OSD.cc b/src/osd/OSD.cc
index 6247c40a4c536..f09055e5bc83c 100644
--- a/src/osd/OSD.cc
+++ b/src/osd/OSD.cc
@@ -1513,6 +1513,7 @@ void OSD::load_pgs()
     derr << "failed to list pgs: " << cpp_strerror(-r) << dendl;
   }
 
+  map<pg_t, interval_set<snapid_t> > pgs;
   for (vector<coll_t>::iterator it = ls.begin();
        it != ls.end();
        it++) {
@@ -1546,8 +1547,16 @@ void OSD::load_pgs()
     if (snap != CEPH_NOSNAP) {
       dout(10) << "load_pgs skipping snapped dir " << *it
 	       << " (pg " << pgid << " snap " << snap << ")" << dendl;
+      pgs[pgid].insert(snap);
       continue;
     }
+    pgs[pgid];
+  }
+
+  for (map<pg_t, interval_set<snapid_t> >::iterator i = pgs.begin();
+       i != pgs.end();
+       ++i) {
+    pg_t pgid(i->first);
 
     if (!osdmap->have_pg_pool(pgid.pool())) {
       dout(10) << __func__ << ": skipping PG " << pgid << " because we don't have pool "
@@ -1562,13 +1571,15 @@ void OSD::load_pgs()
     }
 
     bufferlist bl;
-    epoch_t map_epoch = PG::peek_map_epoch(store, *it, &bl);
+    epoch_t map_epoch = PG::peek_map_epoch(store, coll_t(pgid), &bl);
 
     PG *pg = _open_lock_pg(map_epoch == 0 ? osdmap : service.get_map(map_epoch), pgid);
 
     // read pg state, log
     pg->read_state(store, bl);
 
+    pg->check_ondisk_snap_colls(i->second);
+
     set<pg_t> split_pgs;
     if (osdmap->have_pg_pool(pg->info.pgid.pool()) &&
 	pg->info.pgid.is_split(pg->get_osdmap()->get_pg_num(pg->info.pgid.pool()),
diff --git a/src/osd/PG.cc b/src/osd/PG.cc
index fc3f8c24b1f6a..595cd3fdf7b1c 100644
--- a/src/osd/PG.cc
+++ b/src/osd/PG.cc
@@ -3134,6 +3134,18 @@ void PG::sub_op_scrub_stop(OpRequestRef op)
   osd->send_message_osd_cluster(reply, m->get_connection());
 }
 
+
+void PG::check_ondisk_snap_colls(
+  const interval_set<snapid_t> &ondisk_snapcolls)
+{
+  if (!(ondisk_snapcolls == snap_collections)) {
+    derr << "ondisk_snapcolls: " << ondisk_snapcolls
+	 << " does not match snap_collections " << snap_collections
+	 << " repairing." << dendl;
+    snap_collections = ondisk_snapcolls;
+  }
+}
+
 void PG::clear_scrub_reserved()
 {
   osd->scrub_wq.dequeue(this);
diff --git a/src/osd/PG.h b/src/osd/PG.h
index ba80f8186e6c9..68e886802b5c9 100644
--- a/src/osd/PG.h
+++ b/src/osd/PG.h
@@ -1002,6 +1002,8 @@ class PG {
     ino_t hino, const hobject_t &hoid,
     const map<string, bufferptr> &attrs,
     set<snapid_t> *snapcolls) {};
+  void check_ondisk_snap_colls(
+    const interval_set<snapid_t> &ondisk_snapcolls);
   void clear_scrub_reserved();
   void scrub_reserve_replicas();
   void scrub_unreserve_replicas();