diff --git a/src/common/inc/tdataformat.h b/src/common/inc/tdataformat.h
index f6683e48434e7b5d88028713e9f5957c2c4a6e0f..27052f08db2d8eb4a0ad500305313f48a07781f3 100644
--- a/src/common/inc/tdataformat.h
+++ b/src/common/inc/tdataformat.h
@@ -124,8 +124,8 @@ typedef uint64_t TKEY;
 
 #define TKEY_INVALID UINT64_MAX
 #define TKEY_NULL TKEY_INVALID
-#define TKEY_NEGATIVE_FLAG (((TKEY)1) << (sizeof(TKEY) * 8 - 1))
-#define TKEY_DELETE_FLAG (((TKEY)1) << (sizeof(TKEY) * 8 - 2))
+#define TKEY_NEGATIVE_FLAG (((TKEY)1) << 63)
+#define TKEY_DELETE_FLAG (((TKEY)1) << 62)
 #define TKEY_VALUE_FILTER (~(TKEY_NEGATIVE_FLAG | TKEY_DELETE_FLAG))
 
 #define TKEY_IS_NEGATIVE(tkey) (((tkey)&TKEY_NEGATIVE_FLAG) != 0)
diff --git a/src/tsdb/src/tsdbMemTable.c b/src/tsdb/src/tsdbMemTable.c
index 2bdb95163d5b8077cc3228ae66e1e77a0562c075..19f59f30807a925db022b15d21ef2f213c1512db 100644
--- a/src/tsdb/src/tsdbMemTable.c
+++ b/src/tsdb/src/tsdbMemTable.c
@@ -113,7 +113,6 @@ int tsdbUpdateRowInMem(STsdbRepo *pRepo, SDataRow row, STable *pTable) {
     } else {
       if (TABLE_LASTKEY(pTable) < key) TABLE_LASTKEY(pTable) = key;
     }
-    if ((!isRowDelete) && (TABLE_LASTKEY(pTable) < key)) TABLE_LASTKEY(pTable) = key;
 
     if (pMemTable->keyFirst > key) pMemTable->keyFirst = key;
     if (pMemTable->keyLast < key) pMemTable->keyLast = key;