diff --git a/mini-lsm-mvcc/src/compact.rs b/mini-lsm-mvcc/src/compact.rs
index 5b9f736..b578d36 100644
--- a/mini-lsm-mvcc/src/compact.rs
+++ b/mini-lsm-mvcc/src/compact.rs
@@ -161,7 +161,7 @@ impl LsmStorageInner {
             }
 
             if iter.key().ts() <= watermark {
-                if same_as_last_key && !first_key_below_watermark {
+                if !first_key_below_watermark {
                     iter.next()?;
                     continue;
                 }