diff --git a/src/storage/compaction/ob_partition_merge_iter.cpp b/src/storage/compaction/ob_partition_merge_iter.cpp
index 1e5b73b09..f36ffd817 100644
--- a/src/storage/compaction/ob_partition_merge_iter.cpp
+++ b/src/storage/compaction/ob_partition_merge_iter.cpp
@@ -1179,7 +1179,7 @@ int ObPartitionMicroMergeIter::get_curr_range(ObDatumRange &range) const
  */
 ObPartitionMinorRowMergeIter::ObPartitionMinorRowMergeIter(common::ObIAllocator &allocator)
   : ObPartitionMergeIter(allocator),
-    obj_copy_allocator_("MinorMergeObj", OB_MALLOC_MIDDLE_BLOCK_SIZE, ObCtxIds::MERGE_NORMAL_CTX_ID),
+    obj_copy_allocator_("MinorMergeObj", OB_MALLOC_MIDDLE_BLOCK_SIZE, MTL_ID(), ObCtxIds::MERGE_NORMAL_CTX_ID),
     nop_pos_(),
     row_queue_(),
     check_committing_trans_compacted_(true),