diff --git a/be/src/cloud/cloud_tablet.cpp b/be/src/cloud/cloud_tablet.cpp
index c7a85fc820d2c4..8e10bf15298696 100644
--- a/be/src/cloud/cloud_tablet.cpp
+++ b/be/src/cloud/cloud_tablet.cpp
@@ -780,7 +780,7 @@ Status CloudTablet::calc_delete_bitmap_for_compaction(
             input_rowsets, rowid_conversion, 0, version.second + 1, missed_rows.get(),
             location_map.get(), tablet_meta()->delete_bitmap(), output_rowset_delete_bitmap.get());
     if (missed_rows) {
-        std::size_t missed_rows_size = missed_rows->size();
+        missed_rows_size = missed_rows->size();
         if (!allow_delete_in_cumu_compaction) {
             if (compaction_type == ReaderType::READER_CUMULATIVE_COMPACTION &&
                 tablet_state() == TABLET_RUNNING) {