diff --git a/velox/functions/prestosql/ArrayIntersectExcept.cpp b/velox/functions/prestosql/ArrayIntersectExcept.cpp
index 36f80612822d2..8d6784fe47486 100644
--- a/velox/functions/prestosql/ArrayIntersectExcept.cpp
+++ b/velox/functions/prestosql/ArrayIntersectExcept.cpp
@@ -338,7 +338,7 @@ class ArrayIntersectExceptFunction : public exec::VectorFunction {
 
     auto leftElementsCount =
         countElements<ArrayVector>(rows, *decodedLeftArray);
-    vector_size_t rowCount = left->size();
+    vector_size_t rowCount = rows.end();
 
     // Allocate new vectors for indices, nulls, length and offsets.
     BufferPtr newIndices = allocateIndices(leftElementsCount, pool);