diff --git a/jmalib-log/src/main/java/com/microavia/jmalib/log/ulog/ULogReader.java b/jmalib-log/src/main/java/com/microavia/jmalib/log/ulog/ULogReader.java
index 16db852..53ecd34 100644
--- a/jmalib-log/src/main/java/com/microavia/jmalib/log/ulog/ULogReader.java
+++ b/jmalib-log/src/main/java/com/microavia/jmalib/log/ulog/ULogReader.java
@@ -304,6 +304,7 @@ private void handleHeaderMessage(long pos, int msgType, int msgSize) throws IOEx
                         }
                         context.getStructs().put(name, struct);
                         topicByName.put(name, new Topic(name, struct, msgId));
+                        addFieldsToList(name, struct);
                     }
                 } else {
                     String[] descr = getString(buffer, msgSize).split(":");