diff --git a/mini-lsm-mvcc/src/mem_table.rs b/mini-lsm-mvcc/src/mem_table.rs
index 5b6dd50..92d90d7 100644
--- a/mini-lsm-mvcc/src/mem_table.rs
+++ b/mini-lsm-mvcc/src/mem_table.rs
@@ -152,8 +152,7 @@ impl MemTable {
             item: (KeyBytes::new(), Bytes::new()),
         }
         .build();
-        let entry = iter.with_iter_mut(|iter| MemTableIterator::entry_to_item(iter.next()));
-        iter.with_mut(|x| *x.item = entry);
+        iter.next().unwrap();
         iter
     }
 
diff --git a/mini-lsm/src/mem_table.rs b/mini-lsm/src/mem_table.rs
index d5efc51..89da268 100644
--- a/mini-lsm/src/mem_table.rs
+++ b/mini-lsm/src/mem_table.rs
@@ -119,8 +119,7 @@ impl MemTable {
             item: (Bytes::new(), Bytes::new()),
         }
         .build();
-        let entry = iter.with_iter_mut(|iter| MemTableIterator::entry_to_item(iter.next()));
-        iter.with_mut(|x| *x.item = entry);
+        iter.next().unwrap();
         iter
     }