diff --git a/activemq-core/src/main/java/org/apache/activemq/store/kahadb/MessageDatabase.java b/activemq-core/src/main/java/org/apache/activemq/store/kahadb/MessageDatabase.java
index a4ea7a6dba..3b83ee0398 100644
--- a/activemq-core/src/main/java/org/apache/activemq/store/kahadb/MessageDatabase.java
+++ b/activemq-core/src/main/java/org/apache/activemq/store/kahadb/MessageDatabase.java
@@ -1202,6 +1202,7 @@ public class MessageDatabase extends ServiceSupport implements BrokerServiceAwar
             }
 
             // check we are not deleting file with ack for in-use journal files
+            LOG.debug("gc candidates: " + gcCandidateSet);
             final TreeSet<Integer> gcCandidates = new TreeSet<Integer>(gcCandidateSet);
             Iterator<Integer> candidates = gcCandidateSet.iterator();
             while (candidates.hasNext()) {