diff --git a/engine/storage_mongo_datadb.go b/engine/storage_mongo_datadb.go
index 04aad0010..7889d7a26 100644
--- a/engine/storage_mongo_datadb.go
+++ b/engine/storage_mongo_datadb.go
@@ -112,7 +112,7 @@ func NewMongoStorage(host, port, db, user, pass, storageType string, cdrsIndexes
 			return nil, err
 		}
 	}
-	ms.Counter = utils.NewCounterGen(1000)
+	ms.cnter = utils.NewCounterGen(1000)
 	return
 }
 
@@ -124,7 +124,7 @@ type MongoStorage struct {
 	cacheCfg        *config.CacheConfig
 	loadHistorySize int
 	cdrsIndexes     []string
-	Counter         *utils.CounterGen
+	cnter           *utils.CounterGen
 }
 
 func (ms *MongoStorage) conn(col string) (*mgo.Session, *mgo.Collection) {
diff --git a/engine/storage_mongo_stordb.go b/engine/storage_mongo_stordb.go
index 55318ab95..3791d60d7 100644
--- a/engine/storage_mongo_stordb.go
+++ b/engine/storage_mongo_stordb.go
@@ -883,7 +883,7 @@ func (ms *MongoStorage) GetSMCosts(cgrid, runid, originHost, originIDPrefix stri
 
 func (ms *MongoStorage) SetCDR(cdr *CDR, allowUpdate bool) (err error) {
 	if cdr.OrderID == 0 {
-		cdr.OrderID = time.Now().UnixNano() + ms.Counter.Gen()
+		cdr.OrderID = time.Now().UnixNano() + ms.cnter.Gen()
 	}
 	session, col := ms.conn(utils.TBL_CDRS)
 	defer session.Close()