diff --git a/job.go b/job.go
index e3775e0..f7815a3 100644
--- a/job.go
+++ b/job.go
@@ -1576,13 +1576,15 @@ func jobGWithdraw(j Job) {
 		sha128 := sha256[:aes.BlockSize]
 		c, err := aes.NewCipher(sha128)
 
-		in := make([]byte, 8)
-		binary.LittleEndian.PutUint64(in, uint64(id))
+		in := make([]byte, 0)
+		buf := make([]byte, 8)
+		binary.LittleEndian.PutUint64(buf, uint64(id))
+		in = append(in, buf...)
+		binary.LittleEndian.PutUint64(buf, uint64(j.UserID64))
+		in = append(in, buf...)
 		out := make([]byte, len(in))
 
 		c.Encrypt(out, in)
-		out = append(out, 0)
-		out = append(out, 0)
 		ref := hex.EncodeToString(out)
 
 		log.Printf("jobGWithdraw[%d] : got all the info for ref %s\n", j.ID64, string(ref))