diff --git a/posting/list.go b/posting/list.go
index 2a3638cca01..7c0f6749df7 100644
--- a/posting/list.go
+++ b/posting/list.go
@@ -1010,7 +1010,7 @@ func (l *List) setMutationAfterCommit(startTs, commitTs uint64, pl *pb.PostingLi
 	if refresh {
 		newMap := make(map[uint64]*pb.Posting, len(l.mutationMap.committedUids))
 		for uid, post := range l.mutationMap.committedUids {
-			newMap[uid] = post
+			newMap[uid] = proto.Clone(post).(*pb.Posting)
 		}
 		l.mutationMap.committedUids = newMap
 	}