diff --git a/tests/Doctrine/Tests/DBAL/Functional/Schema/MySqlSchemaManagerTest.php b/tests/Doctrine/Tests/DBAL/Functional/Schema/MySqlSchemaManagerTest.php
index 6fbb8cbc989..acd789b1c4f 100644
--- a/tests/Doctrine/Tests/DBAL/Functional/Schema/MySqlSchemaManagerTest.php
+++ b/tests/Doctrine/Tests/DBAL/Functional/Schema/MySqlSchemaManagerTest.php
@@ -110,14 +110,14 @@ public function testSpatialIndex()
     public function testIndexWithLength()
     {
         $table = new Table('index_length');
-        $table->addColumn('text', 'text');
-        $table->addIndex(['text'], 'text_index', [], ['lengths' => [768]]);
+        $table->addColumn('text', 'string', ['length' => 255]);
+        $table->addIndex(['text'], 'text_index', [], ['lengths' => [128]]);
 
         $this->schemaManager->dropAndCreateTable($table);
 
         $indexes = $this->schemaManager->listTableIndexes('index_length');
         self::assertArrayHasKey('text_index', $indexes);
-        self::assertSame([768], $indexes['text_index']->getOption('lengths'));
+        self::assertSame([128], $indexes['text_index']->getOption('lengths'));
     }
 
     /**