diff --git a/dbt/include/risingwave/macros/materializations/incremental.sql b/dbt/include/risingwave/macros/materializations/incremental.sql
index 8e8bb18..1112a09 100644
--- a/dbt/include/risingwave/macros/materializations/incremental.sql
+++ b/dbt/include/risingwave/macros/materializations/incremental.sql
@@ -38,6 +38,7 @@
       {% set need_swap = true %}
   {% else %}
     {% do run_query(risingwave__create_table_as(temp_relation, sql)) %}
+    {% do to_drop.append(temp_relation) %}
     {% do adapter.expand_target_column_types(
              from_relation=temp_relation,
              to_relation=target_relation) %}