diff --git a/src/utils/debug.c b/src/utils/debug.c
index fc51f5ef2678226e059561fab73a636ec528e856..6db5ac4721d3b238705651a524c88fabe7956cb5 100644
--- a/src/utils/debug.c
+++ b/src/utils/debug.c
@@ -257,8 +257,8 @@ void _log_cmdu(int level, void *var, bool flag)
 		btostr(btlv, len, bstr);
 		tlv = json_object_new_string(bstr);
 		tlv_type = json_object_new_string(map_stringify_tlv_type(*type));
-		json_object_object_add(tlv_object, "DATA", tlv);
-		json_object_object_add(tlv_object, "TYPE", tlv_type);
+		json_object_object_add(tlv_object, "data", tlv);
+		json_object_object_add(tlv_object, "type", tlv_type);
 		json_object_array_add(tlvarray, tlv_object);
 		free(btlv);
 		free(bstr);
@@ -270,13 +270,13 @@ void _log_cmdu(int level, void *var, bool flag)
 	intfname = json_object_new_string(cmdu->intf_name);
 	msg = json_object_new_string(map_stringify_cmdu_type(cmdu->message_type));
 
-	json_object_object_add(main_object, "MESSAGE VERSION", msgversion);
-	json_object_object_add(main_object, "MESSAGE TYPE", msgtype);
-	json_object_object_add(main_object, "MESSAGE ID", msgid);
-	json_object_object_add(main_object, "INTERFACE NAME", intfname);
-	json_object_object_add(main_object, "MESSAGE", msg);
-	json_object_object_add(main_object, "DIRECTION", direction);
-	json_object_object_add(main_object, "TLVS", tlvarray);
+	json_object_object_add(main_object, "message_version", msgversion);
+	json_object_object_add(main_object, "message_type", msgtype);
+	json_object_object_add(main_object, "message_id", msgid);
+	json_object_object_add(main_object, "interface_name", intfname);
+	json_object_object_add(main_object, "message", msg);
+	json_object_object_add(main_object, "direction", direction);
+	json_object_object_add(main_object, "tlvs", tlvarray);
 
 	fprintf(testfile, "%s\n", json_object_to_json_string(main_object));