diff --git a/apps/theming/lib/Jobs/MigrateBackgroundImages.php b/apps/theming/lib/Jobs/MigrateBackgroundImages.php
index 97665d1179fde..62179e46a4ba1 100644
--- a/apps/theming/lib/Jobs/MigrateBackgroundImages.php
+++ b/apps/theming/lib/Jobs/MigrateBackgroundImages.php
@@ -30,6 +30,7 @@
 use OCP\AppFramework\Utility\ITimeFactory;
 use OCP\BackgroundJob\IJobList;
 use OCP\BackgroundJob\QueuedJob;
+use OCP\DB\QueryBuilder\IQueryBuilder;
 use OCP\Files\AppData\IAppDataFactory;
 use OCP\Files\IAppData;
 use OCP\Files\NotFoundException;
@@ -92,7 +93,7 @@ protected function runPreparation(): void {
 				->from('preferences')
 				->where($selector->expr()->eq('appid', $selector->createNamedParameter('theming')))
 				->andWhere($selector->expr()->eq('configkey', $selector->createNamedParameter('background')))
-				->andWhere($selector->expr()->eq('configvalue', $selector->createNamedParameter('custom')))
+				->andWhere($selector->expr()->eq('configvalue', $selector->createNamedParameter('custom', IQueryBuilder::PARAM_STR), IQueryBuilder::PARAM_STR))
 				->executeQuery();
 
 			$userIds = $result->fetchAll(\PDO::FETCH_COLUMN);
diff --git a/tests/lib/DB/QueryBuilder/ExpressionBuilderDBTest.php b/tests/lib/DB/QueryBuilder/ExpressionBuilderDBTest.php
index 4a168cb014350..35d8b4faa343a 100644
--- a/tests/lib/DB/QueryBuilder/ExpressionBuilderDBTest.php
+++ b/tests/lib/DB/QueryBuilder/ExpressionBuilderDBTest.php
@@ -132,6 +132,24 @@ public function testCastColumn(): void {
 		$this->assertEquals(1, $result);
 	}
 
+	public function testLongText(): void {
+		$appId = $this->getUniqueID('testing');
+		$this->createConfig($appId, 'mykey', 'myvalue');
+
+		$query = $this->connection->getQueryBuilder();
+		$query->select('*')
+			->from('appconfig')
+			->where($query->expr()->eq('appid', $query->createNamedParameter($appId)))
+			->andWhere($query->expr()->eq('configkey', $query->createNamedParameter('mykey')))
+			->andWhere($query->expr()->eq('configvalue', $query->createNamedParameter('myvalue', IQueryBuilder::PARAM_STR), IQueryBuilder::PARAM_STR));
+
+		$result = $query->executeQuery();
+		$entries = $result->fetchAll();
+		$result->closeCursor();
+		self::assertCount(1, $entries);
+		self::assertEquals('myvalue', $entries[0]['configvalue']);
+	}
+
 	protected function createConfig($appId, $key, $value) {
 		$query = $this->connection->getQueryBuilder();
 		$query->insert('appconfig')