diff --git a/src/sql/plan_cache/ob_cache_object.h b/src/sql/plan_cache/ob_cache_object.h
index 4e486c015b..d702e96109 100644
--- a/src/sql/plan_cache/ob_cache_object.h
+++ b/src/sql/plan_cache/ob_cache_object.h
@@ -132,7 +132,6 @@ struct ObParamInfo
   bool is_oracle_empty_string_;
   common::ObCollationType col_type_;
   common::ObPrecision precision_;
-  uint64_t udt_id_;
 
   OB_UNIS_VERSION_V(1);
 };