diff --git a/src/sql/rewrite/ob_key_part.cpp b/src/sql/rewrite/ob_key_part.cpp
index 241c1e37b..8379bb2d6 100644
--- a/src/sql/rewrite/ob_key_part.cpp
+++ b/src/sql/rewrite/ob_key_part.cpp
@@ -745,6 +745,7 @@ InParamMeta* ObInKeyPart::create_param_meta(ObIAllocator &alloc)
   if (OB_NOT_NULL(ptr = alloc.alloc(sizeof(InParamMeta)))) {
     new_param = new(ptr) InParamMeta();
     new_param->vals_.set_block_allocator(ModulePageAllocator(alloc));
+    new_param->pos_.enum_set_values_.set_block_allocator(ModulePageAllocator(alloc));
   }
   return new_param;
 }
@@ -905,6 +906,7 @@ int ObKeyPartPos::set_enum_set_values(common::ObIAllocator &allocator,
 {
   int ret = OB_SUCCESS;
   ObString value;
+  enum_set_values_.set_block_allocator(ModulePageAllocator(allocator));
   for (int64_t i = 0; OB_SUCC(ret) && i < enum_set_values.count(); ++i) {
     value.reset();
     if (OB_FAIL(ob_write_string(allocator, enum_set_values.at(i), value))) {