diff --git a/pkg/common/storage/database/mgo/conversation.go b/pkg/common/storage/database/mgo/conversation.go
index c1d00f0ed..30f08f5e5 100644
--- a/pkg/common/storage/database/mgo/conversation.go
+++ b/pkg/common/storage/database/mgo/conversation.go
@@ -51,7 +51,7 @@ func NewConversationMongo(db *mongo.Database) (*ConversationMgo, error) {
 			Keys: bson.D{
 				{Key: "conversation_id", Value: 1},
 			},
-			Options: options.Index().SetUnique(true),
+			Options: options.Index(),
 		},
 	})
 	if err != nil {