diff --git a/src/DMLQueryBuilder.php b/src/DMLQueryBuilder.php
index 2fd5d3034..aa644724c 100644
--- a/src/DMLQueryBuilder.php
+++ b/src/DMLQueryBuilder.php
@@ -72,14 +72,6 @@ public function upsert(
         bool|array $updateColumns,
         array &$params
     ): string {
-        if (!$insertColumns instanceof QueryInterface) {
-            $insertColumns = $this->normalizeColumnNames($table, $insertColumns);
-        }
-
-        if (!is_bool($updateColumns)) {
-            $updateColumns = $this->normalizeColumnNames($table, $updateColumns);
-        }
-
         /** @var Constraint[] $constraints */
         $constraints = [];