diff --git a/cpp/velox/utils/VeloxBatchAppender.cc b/cpp/velox/utils/VeloxBatchAppender.cc
index 719a9400529a7..8fa1ade217e02 100644
--- a/cpp/velox/utils/VeloxBatchAppender.cc
+++ b/cpp/velox/utils/VeloxBatchAppender.cc
@@ -42,7 +42,7 @@ std::shared_ptr<ColumnarBatch> VeloxBatchAppender::next() {
   buffer->append(rv.get());
 
   for (auto nextCb = in_->next(); nextCb != nullptr; nextCb = in_->next()) {
-    auto nextVb = VeloxColumnarBatch::from(pool_, cb);
+    auto nextVb = VeloxColumnarBatch::from(pool_, nextCb);
     auto nextRv = nextVb->getRowVector();
     buffer->append(nextRv.get());
     if (buffer->size() >= minOutputBatchSize_) {