diff --git a/apps/dav/tests/unit/Connector/Sabre/MaintenancePluginTest.php b/apps/dav/tests/unit/Connector/Sabre/MaintenancePluginTest.php
index 94bd1bb0b3..afef4e9141 100644
--- a/apps/dav/tests/unit/Connector/Sabre/MaintenancePluginTest.php
+++ b/apps/dav/tests/unit/Connector/Sabre/MaintenancePluginTest.php
@@ -55,7 +55,7 @@ class MaintenancePluginTest extends TestCase {
 
 	public function testMaintenanceMode() {
 		$this->expectException(\Sabre\DAV\Exception\ServiceUnavailable::class);
-		$this->expectExceptionMessage('System in maintenance mode.');
+		$this->expectExceptionMessage('System is in maintenance mode.');
 
 		$this->config
 			->expects($this->exactly(1))