diff --git a/apps/dav/lib/CalDAV/ResourceBooking/AbstractPrincipalBackend.php b/apps/dav/lib/CalDAV/ResourceBooking/AbstractPrincipalBackend.php
index 462bc637e72f5..84fe77354c675 100644
--- a/apps/dav/lib/CalDAV/ResourceBooking/AbstractPrincipalBackend.php
+++ b/apps/dav/lib/CalDAV/ResourceBooking/AbstractPrincipalBackend.php
@@ -353,7 +353,7 @@ private function searchPrincipalsByRoomFeature(string $key, string $value, array
 	 */
 	private function searchPrincipalsByCapacity(string $key, string $value, array $usersGroups = []): array {
 		$query = $this->getMetadataQuery($key);
-		$query->andWhere($query->expr()->gte('value', $query->createNamedParameter($value)));
+		$query->andWhere($query->expr()->gte($query->expr()->castColumn('value', IQueryBuilder::PARAM_INT), $query->createNamedParameter((int)$value, IQueryBuilder::PARAM_INT)));
 		return $this->getRows($query, $usersGroups);
 	}