diff --git a/paddle/fluid/operators/detail/variable_response.cc b/paddle/fluid/operators/detail/variable_response.cc
index d0f103c45562c5b6d2cd39712a70014b7863a0d8..3787b139a5b40bfc18df27e443edb8649fb711ae 100644
--- a/paddle/fluid/operators/detail/variable_response.cc
+++ b/paddle/fluid/operators/detail/variable_response.cc
@@ -153,7 +153,7 @@ bool VariableResponse::CopySelectRowsData(
     const platform::DeviceContext& ctx, int length) {
   auto var = scope_->FindVar(meta_.varname());
   auto* slr = var->GetMutable<framework::SelectedRows>();
-  slr->mutable_rows()->resize(length / 8);
+  slr->mutable_rows()->resize(length / 8);  // int64
   int64_t* rows_data = slr->mutable_rows()->data();
 
   // copy rows CPU data, GPU data will be copied lazily.