diff --git a/runtime/drivers/bigquery/warehouse.go b/runtime/drivers/bigquery/warehouse.go
index 89cc57e64022..b446f3ae8795 100644
--- a/runtime/drivers/bigquery/warehouse.go
+++ b/runtime/drivers/bigquery/warehouse.go
@@ -211,6 +211,7 @@ var _ drivers.FileIterator = &fileIterator{}
 
 // Close implements drivers.FileIterator.
 func (f *fileIterator) Close() error {
+	f.client.Close()
 	return os.RemoveAll(f.tempDir)
 }