diff --git a/pageserver/src/object_repository.rs b/pageserver/src/object_repository.rs
index 74dbadd82f..5d9487d6be 100644
--- a/pageserver/src/object_repository.rs
+++ b/pageserver/src/object_repository.rs
@@ -642,7 +642,7 @@ impl Timeline for ObjectTimeline {
         assert!(old <= lsn);
 
         // Use old value of last_record_lsn as prev_record_lsn
-        self.prev_record_lsn.fetch_max(old);
+        self.prev_record_lsn.fetch_max(Lsn((old.0 + 7) & !7));
 
         // Also advance last_valid_lsn
         let old = self.last_valid_lsn.advance(lsn);