diff --git a/sql.go b/sql.go
index 8aef2a3..70e6c90 100644
--- a/sql.go
+++ b/sql.go
@@ -1325,8 +1325,15 @@ func insertMsgAuctionAnnounce(m *ChatWarsMessageAuctionAnnounce) error {
 }
 
 func createJob(job_type_id int32, priority int32, schedule time.Time, payload []byte) error {
-	res, err := db.Exec(`INSERT INTO obj (obj_type_id, obj_sub_type_id)
-							          VALUES (` + strconv.Itoa(int(objTypeJob)) + `,` + strconv.Itoa(job_type_id) + `);`)
+	stmt, err := db.Prepare(`INSERT INTO obj (obj_type_id, obj_sub_type_id)
+								 VALUES 	 (?          , ?);`)
+	logOnError(err, "createJob : prepare insert obj")
+	if err != nil {
+		return err
+	}
+	defer stmt.Close()
+
+	res, err = stmt.Exec(objTypeJob, job_type_id)
 	logOnError(err, "createJob : insert obj")
 	if err != nil {
 		return err