diff --git oak-segment-tar/src/main/java/org/apache/jackrabbit/oak/segment/tool/Compact.java oak-segment-tar/src/main/java/org/apache/jackrabbit/oak/segment/tool/Compact.java
index a99a644..8bf2aa4 100644
--- oak-segment-tar/src/main/java/org/apache/jackrabbit/oak/segment/tool/Compact.java
+++ oak-segment-tar/src/main/java/org/apache/jackrabbit/oak/segment/tool/Compact.java
@@ -120,7 +120,7 @@ public class Compact implements Runnable {
             File journal = new File(path, "journal.log");
             String head;
             try (JournalReader journalReader = new JournalReader(journal)) {
-                head = journalReader.next() + " root " + System.currentTimeMillis() + "\n";
+                head = journalReader.next().getRevision() + " root " + System.currentTimeMillis() + "\n";
             }

             try (RandomAccessFile journalFile = new RandomAccessFile(journal, "rw")) {