diff --git a/helper/ccnx-header-helper.h b/helper/ccnx-header-helper.h
index 72d030c..0cfbd12 100644
--- a/helper/ccnx-header-helper.h
+++ b/helper/ccnx-header-helper.h
@@ -23,6 +23,12 @@
 
 #include "ns3/ptr.h"
 
+#define INTEREST_BYTE0 0x01
+#define INTEREST_BYTE1 0xD2
+
+#define CONTENT_OBJECT_BYTE0 0x04
+#define CONTENT_OBJECT_BYTE1 0x82
+
 namespace ns3
 {