diff --git a/tests/acceptance/features/bootstrap/WebDavPropertiesContext.php b/tests/acceptance/features/bootstrap/WebDavPropertiesContext.php
index 9a1b4ccb858f..6505d2f4d48b 100644
--- a/tests/acceptance/features/bootstrap/WebDavPropertiesContext.php
+++ b/tests/acceptance/features/bootstrap/WebDavPropertiesContext.php
@@ -322,7 +322,7 @@ public function assertValueOfItemInResponseRegExp($xpath, $pattern) {
 		);
 		$value = $xmlPart[0]->__toString();
 		$pattern = $this->featureContext->substituteInLineCodes(
-			$pattern
+			$pattern, ['preg_quote' => ['/'] ]
 		);
 		PHPUnit\Framework\Assert::assertRegExp(
 			$pattern, $value,