diff --git a/agents/issue_triage/marker.py b/agents/issue_triage/marker.py
index e1ba8dd..edeb07a 100644
--- a/agents/issue_triage/marker.py
+++ b/agents/issue_triage/marker.py
@@ -48,7 +48,7 @@ class TriageMarker:
 
 
 def find_prior_marker(issue: IssueContext) -> TriageMarker | None:
-    logger.debug(json.dumps(issue.comments, indent=4))
+    logger.debug(json.dumps([c.model_dump() for c in issue.comments], indent=4))
     for c in reversed(issue.comments):
         m = TriageMarker.parse(c['body'])
         if m: