diff --git a/src/common/backend/catalog/index.cpp b/src/common/backend/catalog/index.cpp
index 2dda128ace30874b684e9316805f3daeea0ef0c2..060fa3326383f40ab86bde318c056819d5250f6e 100644
--- a/src/common/backend/catalog/index.cpp
+++ b/src/common/backend/catalog/index.cpp
@@ -5394,8 +5394,8 @@ void reindex_index(Oid indexId, Oid indexPartId, bool skip_constraint_checks,
 
     // determine the lock mode
     if (OidIsValid(indexPartId)) {
-        indexLockMode = AccessShareLock;
-        heapLockMode = AccessShareLock;
+        indexLockMode = ShareUpdateExclusiveLock;
+        heapLockMode = ShareUpdateExclusiveLock;
     } else if (IsGlobalTempTableParallelTrunc() && isTruncGTT) {
         indexLockMode = RowExclusiveLock;
         heapLockMode = RowExclusiveLock;