diff --git a/src/backend/access/transam/multixact.c b/src/backend/access/transam/multixact.c
index d5ac2d87380..08a1d08b547 100644
--- a/src/backend/access/transam/multixact.c
+++ b/src/backend/access/transam/multixact.c
@@ -3577,7 +3577,6 @@ multixact_redo(XLogReaderState *record)
 	else if (info == XLOG_MULTIXACT_TRUNCATE_ID)
 	{
 		xl_multixact_truncate xlrec;
-		int64		pageno;
 
 		memcpy(&xlrec, XLogRecGetData(record),
 			   SizeOfMultiXactTruncate);
@@ -3602,15 +3601,6 @@ multixact_redo(XLogReaderState *record)
 		SetMultiXactIdLimit(xlrec.endTruncOff, xlrec.oldestMultiDB, false);
 
 		PerformMembersTruncation(xlrec.startTruncMemb, xlrec.endTruncMemb);
-
-		/*
-		 * During XLOG replay, latest_page_number isn't necessarily set up
-		 * yet; insert a suitable value to bypass the sanity test in
-		 * SimpleLruTruncate.
-		 */
-		pageno = MultiXactIdToOffsetPage(xlrec.endTruncOff);
-		pg_atomic_write_u64(&MultiXactOffsetCtl->shared->latest_page_number,
-							pageno);
 		PerformOffsetsTruncation(xlrec.startTruncOff, xlrec.endTruncOff);
 
 		LWLockRelease(MultiXactTruncationLock);
diff --git a/src/include/access/slru.h b/src/include/access/slru.h
index d5ca3447208..f8bf1f1430f 100644
--- a/src/include/access/slru.h
+++ b/src/include/access/slru.h
@@ -110,7 +110,9 @@ typedef struct SlruSharedData
 	/*
 	 * latest_page_number is the page number of the current end of the log;
 	 * this is not critical data, since we use it only to avoid swapping out
-	 * the latest page.
+	 * the latest page.  (An exception: an accurate latest_page_number is
+	 * needed on pg_multixact/offsets to replay WAL generated with older minor
+	 * versions correctly.  See RecordNewMultiXact().)
 	 */
 	pg_atomic_uint64 latest_page_number;