diff --git a/apps/dav/lib/CalDAV/CalDavBackend.php b/apps/dav/lib/CalDAV/CalDavBackend.php
index 11af622d01ef..c474148f5a07 100644
--- a/apps/dav/lib/CalDAV/CalDavBackend.php
+++ b/apps/dav/lib/CalDAV/CalDavBackend.php
@@ -555,7 +555,7 @@ public function createCalendar($principalUri, $calendarUri, array $properties) {
 		}
 		$transp = '{' . Plugin::NS_CALDAV . '}schedule-calendar-transp';
 		if (isset($properties[$transp])) {
-			$values['transparent'] = $properties[$transp]->getValue()==='transparent';
+			$values['transparent'] = $properties[$transp]->getValue() === 'transparent' ? 1 : 0;
 		}
 
 		foreach ($this->propertyMap as $xmlName=>$dbName) {
@@ -599,7 +599,7 @@ public function updateCalendar($calendarId, PropPatch $propPatch) {
 				switch ($propertyName) {
 					case '{' . Plugin::NS_CALDAV . '}schedule-calendar-transp':
 						$fieldName = 'transparent';
-						$newValues[$fieldName] = $propertyValue->getValue() === 'transparent';
+						$newValues[$fieldName] = $propertyValue->getValue() === 'transparent' ? 1 : 0;
 						break;
 					default:
 						$fieldName = $this->propertyMap[$propertyName];
diff --git a/apps/dav/tests/unit/CalDAV/AbstractCalDavBackendTest.php b/apps/dav/tests/unit/CalDAV/AbstractCalDavBackendTest.php
index d3d9309bc395..2b1fc2ef3672 100644
--- a/apps/dav/tests/unit/CalDAV/AbstractCalDavBackendTest.php
+++ b/apps/dav/tests/unit/CalDAV/AbstractCalDavBackendTest.php
@@ -27,6 +27,7 @@
 use OCA\DAV\DAV\GroupPrincipalBackend;
 use OCP\IConfig;
 use OCP\Security\ISecureRandom;
+use Sabre\CalDAV\Xml\Property\ScheduleCalendarTransp;
 use Sabre\CalDAV\Xml\Property\SupportedCalendarComponentSet;
 use Test\TestCase;
 
@@ -104,7 +105,8 @@ public function tearDown() {
 	 */
 	protected function createTestCalendar() {
 		$this->backend->createCalendar(self::UNIT_TEST_USER, 'Example', [
-			'{http://apple.com/ns/ical/}calendar-color' => '#1C4587FF'
+			'{http://apple.com/ns/ical/}calendar-color' => '#1C4587FF',
+			'{urn:ietf:params:xml:ns:caldav}schedule-calendar-transp'  => new ScheduleCalendarTransp('opaque')
 		]);
 		$calendars = $this->backend->getCalendarsForUser(self::UNIT_TEST_USER);
 		$this->assertCount(1, $calendars);
@@ -114,6 +116,8 @@ protected function createTestCalendar() {
 		$this->assertEquals(['VEVENT','VTODO'], $components->getValue());
 		$color = $calendars[0]['{http://apple.com/ns/ical/}calendar-color'];
 		$this->assertEquals('#1C4587FF', $color);
+		$transparent = $calendars[0]['{urn:ietf:params:xml:ns:caldav}schedule-calendar-transp'];
+		self::assertEquals(new ScheduleCalendarTransp('opaque'), $transparent);
 		$this->assertEquals('Example', $calendars[0]['uri']);
 		$this->assertEquals('Example', $calendars[0]['{DAV:}displayname']);
 		return $calendars[0]['id'];
diff --git a/apps/dav/tests/unit/CalDAV/CalDavBackendTest.php b/apps/dav/tests/unit/CalDAV/CalDavBackendTest.php
index 3b8227ac0d58..8226a1d38c16 100644
--- a/apps/dav/tests/unit/CalDAV/CalDavBackendTest.php
+++ b/apps/dav/tests/unit/CalDAV/CalDavBackendTest.php
@@ -28,6 +28,7 @@
 use OCA\DAV\CalDAV\CalDavBackend;
 use OCA\DAV\CalDAV\Calendar;
 use OCP\IL10N;
+use Sabre\CalDAV\Xml\Property\ScheduleCalendarTransp;
 use Sabre\DAV\PropPatch;
 use Sabre\DAV\Xml\Property\Href;
 use Sabre\DAVACL\IACL;
@@ -51,7 +52,8 @@ public function testCalendarOperations() {
 		// update it's display name
 		$patch = new PropPatch([
 			'{DAV:}displayname' => 'Unit test',
-			'{urn:ietf:params:xml:ns:caldav}calendar-description' => 'Calendar used for unit testing'
+			'{urn:ietf:params:xml:ns:caldav}calendar-description' => 'Calendar used for unit testing',
+			'{urn:ietf:params:xml:ns:caldav}schedule-calendar-transp' => new ScheduleCalendarTransp('transparent')
 		]);
 		$this->backend->updateCalendar($calendarId, $patch);
 		$patch->commit();
@@ -59,6 +61,7 @@ public function testCalendarOperations() {
 		$this->assertCount(1, $books);
 		$this->assertEquals('Unit test', $books[0]['{DAV:}displayname']);
 		$this->assertEquals('Calendar used for unit testing', $books[0]['{urn:ietf:params:xml:ns:caldav}calendar-description']);
+		$this->assertEquals(new ScheduleCalendarTransp('transparent'), $books[0]['{urn:ietf:params:xml:ns:caldav}schedule-calendar-transp']);
 
 		// delete the address book
 		$this->backend->deleteCalendar($books[0]['id']);