diff --git a/consensus/db/db.go b/consensus/db/db.go
index 638352f3..f2c4540e 100644
--- a/consensus/db/db.go
+++ b/consensus/db/db.go
@@ -91,7 +91,7 @@ type findRecordQuery struct {
 type updateOp struct {
 	Push struct {
 		Records struct {
-			Each []consensus.Record `bson:"$each""`
+			Each []consensus.Record `bson:"$each"`
 			Pos  int                `bson:"$position"`
 		} `bson:"records"`
 	} `bson:"$push"`