diff --git a/omci_defs.go b/omci_defs.go
index 3062c4a..06f22dd 100644
--- a/omci_defs.go
+++ b/omci_defs.go
@@ -90,7 +90,13 @@
 		log.Printf("binary.Read failed: %s", err)
 		return 0, 0, 0, 0, 0, OmciContent{}, errors.New("binary.Read failed")
 	}
+	/*    Message Type = Set
+        0... .... = Destination Bit: 0x0
+        .1.. .... = Acknowledge Request: 0x1
+        ..0. .... = Acknowledgement: 0x0
+        ...0 1000 = Message Type: Set (8)
+	*/
 	log.Printf("OmciRun - TransactionId: %d MessageType: %d, ME Class: %d, ME Instance: %d, Content: %x",
-		m.TransactionId, m.MessageType&0x0F, m.MessageId.Class, m.MessageId.Instance, m.Content)
-	return m.TransactionId, m.DeviceId, m.MessageType & 0x0F, m.MessageId.Class, m.MessageId.Instance, m.Content, nil
+		m.TransactionId, m.MessageType&0x1F, m.MessageId.Class, m.MessageId.Instance, m.Content)
+	return m.TransactionId, m.DeviceId, m.MessageType & 0x1F, m.MessageId.Class, m.MessageId.Instance, m.Content, nil
 }