diff --git a/velox/exec/GroupingSet.cpp b/velox/exec/GroupingSet.cpp
index 81f21da6377ad..636e8a9170a3e 100644
--- a/velox/exec/GroupingSet.cpp
+++ b/velox/exec/GroupingSet.cpp
@@ -1054,6 +1054,7 @@ bool GroupingSet::getOutputWithSpill(
     // help partial aggregation replay the spilling procedure once needed again.
     merge_ = nullptr;
     mergeRows_ = nullptr;
+    mergeArgs_.clear();
     spiller_ = nullptr;
   }
   return hasData;