diff --git a/release_notes_generator/record/record_factory.py b/release_notes_generator/record/record_factory.py
index 17809488..74db12c4 100644
--- a/release_notes_generator/record/record_factory.py
+++ b/release_notes_generator/record/record_factory.py
@@ -133,6 +133,6 @@ def register_commit_to_record(c: Commit) -> None:
             real_issue_counts,
             len(pulls),
             len(commits),
-            sum(isinstance(nr, str) for nr in records.keys())
+            sum(isinstance(r, IsolatedCommitsRecord) for r in records)
         )
         return records