diff --git a/library/DIAMETER_Templates.ttcn b/library/DIAMETER_Templates.ttcn
index 2cc2986..b27d144 100644
--- a/library/DIAMETER_Templates.ttcn
+++ b/library/DIAMETER_Templates.ttcn
@@ -110,8 +110,8 @@
 ts_DIAMETER(template (value) BIT8 flags,
 	    template (value) Command_Code cmd_code,
 	    template (value) OCTET4 app_id := '00000000'O,
-	    template (value) UINT32 hbh_id,
-	    template (value) UINT32 ete_id,
+	    template (value) UINT32 hbh_id := '00000000'O,
+	    template (value) UINT32 ete_id := '00000000'O,
 	    template (value) AVP_list avps := {}
 ) := {
 	version := 1,