diff --git a/src/backend/postmaster/walsummarizer.c b/src/backend/postmaster/walsummarizer.c
index c1bf4a70dd1..554f5d9e518 100644
--- a/src/backend/postmaster/walsummarizer.c
+++ b/src/backend/postmaster/walsummarizer.c
@@ -641,7 +641,7 @@ SetWalSummarizerLatch(void)
 	if (WalSummarizerCtl == NULL)
 		return;
 
-	LWLockAcquire(WALSummarizerLock, LW_EXCLUSIVE);
+	LWLockAcquire(WALSummarizerLock, LW_SHARED);
 	pgprocno = WalSummarizerCtl->summarizer_pgprocno;
 	LWLockRelease(WALSummarizerLock);
 
@@ -682,7 +682,7 @@ WaitForWalSummarization(XLogRecPtr lsn)
 		/*
 		 * If the LSN summarized on disk has reached the target value, stop.
 		 */
-		LWLockAcquire(WALSummarizerLock, LW_EXCLUSIVE);
+		LWLockAcquire(WALSummarizerLock, LW_SHARED);
 		summarized_lsn = WalSummarizerCtl->summarized_lsn;
 		pending_lsn = WalSummarizerCtl->pending_lsn;
 		LWLockRelease(WALSummarizerLock);