diff --git a/apps/dav/lib/CalDAV/CalDavBackend.php b/apps/dav/lib/CalDAV/CalDavBackend.php
index fd6dc401e18b8..70895ac2c43c0 100644
--- a/apps/dav/lib/CalDAV/CalDavBackend.php
+++ b/apps/dav/lib/CalDAV/CalDavBackend.php
@@ -3214,7 +3214,7 @@ 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();
 					}