diff --git a/src/observer/virtual_table/ob_all_disk_stat.cpp b/src/observer/virtual_table/ob_all_disk_stat.cpp
index 2d742e6184c350093bfa78742acde5205afb75e9..3ecfc374d9321a8dfcd7846b40247d1f76ea0bb0 100644
--- a/src/observer/virtual_table/ob_all_disk_stat.cpp
+++ b/src/observer/virtual_table/ob_all_disk_stat.cpp
@@ -87,7 +87,7 @@ int ObInfoSchemaDiskStatTable::inner_get_next_row(ObNewRow*& row)
           }
           case TOTAL_SIZE: {
             cells[cell_idx].set_int(
-                OB_FILE_SYSTEM.get_total_macro_block_count() * OB_FILE_SYSTEM.get_macro_block_size());
+                OB_FILE_SYSTEM.get_total_macro_block_max_count() * OB_FILE_SYSTEM.get_macro_block_size());
             break;
           }
           case USED_SIZE: {