diff --git a/src/storage/blocksstable/ob_imicro_block_reader.h b/src/storage/blocksstable/ob_imicro_block_reader.h
index fbc2e5fe4..a1d2c6464 100644
--- a/src/storage/blocksstable/ob_imicro_block_reader.h
+++ b/src/storage/blocksstable/ob_imicro_block_reader.h
@@ -277,6 +277,7 @@ public:
     Reader,
     Decoder,
     CSDecoder,
+    MemtableReader,
     MaxReaderType
   };
   ObIMicroBlockReader()