diff --git a/core/modules/migrate/tests/modules/migrate_source_test/src/Plugin/migrate/source/TestSqlSource.php b/core/modules/migrate/tests/modules/migrate_source_test/src/Plugin/migrate/source/TestSqlSource.php
index 5dbf61c..c472e74 100644
--- a/core/modules/migrate/tests/modules/migrate_source_test/src/Plugin/migrate/source/TestSqlSource.php
+++ b/core/modules/migrate/tests/modules/migrate_source_test/src/Plugin/migrate/source/TestSqlSource.php
@@ -32,8 +32,8 @@ public function query() {
    * {@inheritdoc}
    */
   protected function prepareQuery() {
+    $this->query = parent::prepareQuery();
     if (!$this->isQueryPrepared) {
-      $this->query = parent::prepareQuery();
       // Add a custom tag to alter the query in hook_query_TAG_alter(). We check
       // that count query gets altered too.
       $this->query->addTag('some_special_tag');