diff --git a/apps/dav/lib/CalDAV/CalDavBackend.php b/apps/dav/lib/CalDAV/CalDavBackend.php
index 79e1025c5ee49..aa15bce01ccad 100644
--- a/apps/dav/lib/CalDAV/CalDavBackend.php
+++ b/apps/dav/lib/CalDAV/CalDavBackend.php
@@ -3223,7 +3223,7 @@ public function updateProperties($calendarId, $objectUri, $calendarData, $calend
 
 						$query->setParameter('name', $property->name);
 						$query->setParameter('parameter', null);
-						$query->setParameter('value', $value);
+						$query->setParameter('value', mb_strcut($value, 0, 254));
 						$query->executeStatement();
 					}