diff --git a/Classes/Core/Functional/FunctionalTestCase.php b/Classes/Core/Functional/FunctionalTestCase.php
index 87877650..7f0667e9 100644
--- a/Classes/Core/Functional/FunctionalTestCase.php
+++ b/Classes/Core/Functional/FunctionalTestCase.php
@@ -356,7 +356,7 @@ protected function setUp(): void
                 $testbase->createDirectory(dirname($this->instancePath) . '/functional-sqlite-dbs');
                 $localConfiguration['DB']['Connections']['Default']['path'] = $dbPathSqlite;
                 if (($localConfiguration['DB']['charset'] ?? '') === '') {
-                    $localConfiguration['DB']['charset'] = 'utf-8';
+                    $localConfiguration['DB']['charset'] = 'utf8';
                 }
             }