diff --git a/lib/Db/SignRequestMapper.php b/lib/Db/SignRequestMapper.php
index 007cb729de..37517ae136 100644
--- a/lib/Db/SignRequestMapper.php
+++ b/lib/Db/SignRequestMapper.php
@@ -24,7 +24,6 @@
 
 namespace OCA\Libresign\Db;
 
-use Doctrine\DBAL\Platforms\PostgreSQLPlatform;
 use OCA\Libresign\Helper\Pagination;
 use OCA\Libresign\Service\IdentifyMethod\IIdentifyMethod;
 use OCA\Libresign\Service\IdentifyMethodService;
@@ -475,7 +474,7 @@ private function getFilesAssociatedFilesWithMeQueryBuilder(string $userId, ?arra
 		// when the database is PostgreSQL. The problem is that the command
 		// addGroupBy add quotes over all text send as argument. With
 		// PostgreSQL json columns don't have problem if not added to group by.
-		if (!$qb->getConnection()->getDatabasePlatform() instanceof PostgreSQLPlatform) {
+		if ($qb->getConnection()->getDatabaseProvider() !== IDBConnection::PLATFORM_POSTGRES) {
 			$qb->addGroupBy('f.metadata');
 		}
 
diff --git a/tests/psalm-baseline.xml b/tests/psalm-baseline.xml
index d3e9eac6b2..2cffa019d1 100644
--- a/tests/psalm-baseline.xml
+++ b/tests/psalm-baseline.xml
@@ -60,11 +60,6 @@
       <code><![CDATA[QueryBuilder]]></code>
     </UndefinedClass>
   </file>
-  <file src="lib/Db/SignRequestMapper.php">
-    <UndefinedClass>
-      <code><![CDATA[PostgreSQLPlatform]]></code>
-    </UndefinedClass>
-  </file>
   <file src="lib/Files/TemplateLoader.php">
     <InvalidArgument>
       <code><![CDATA[addServiceListener]]></code>