diff --git a/apps/dav/appinfo/v1/caldav.php b/apps/dav/appinfo/v1/caldav.php
index ecc4fbb8b6..c2634a595a 100644
--- a/apps/dav/appinfo/v1/caldav.php
+++ b/apps/dav/appinfo/v1/caldav.php
@@ -47,6 +47,7 @@ $principalBackend = new Principal(
 	\OC::$server->getShareManager(),
 	\OC::$server->getUserSession(),
 	\OC::$server->getConfig(),
+	\OC::$server->getAppManager(),
 	'principals/'
 );
 $db = \OC::$server->getDatabaseConnection();
diff --git a/apps/dav/appinfo/v1/carddav.php b/apps/dav/appinfo/v1/carddav.php
index a424d7afab..60669df60b 100644
--- a/apps/dav/appinfo/v1/carddav.php
+++ b/apps/dav/appinfo/v1/carddav.php
@@ -48,6 +48,7 @@ $principalBackend = new Principal(
 	\OC::$server->getShareManager(),
 	\OC::$server->getUserSession(),
 	\OC::$server->getConfig(),
+	\OC::$server->getAppManager(),
 	'principals/'
 );
 $db = \OC::$server->getDatabaseConnection();
diff --git a/apps/dav/lib/Command/CreateCalendar.php b/apps/dav/lib/Command/CreateCalendar.php
index 45dd9ba941..8e3a4abf8c 100644
--- a/apps/dav/lib/Command/CreateCalendar.php
+++ b/apps/dav/lib/Command/CreateCalendar.php
@@ -78,7 +78,8 @@ class CreateCalendar extends Command {
 			$this->groupManager,
 			\OC::$server->getShareManager(),
 			\OC::$server->getUserSession(),
-			\OC::$server->getConfig()
+			\OC::$server->getConfig(),
+			\OC::$server->getAppManager()
 		);
 		$random = \OC::$server->getSecureRandom();
 		$logger = \OC::$server->getLogger();
diff --git a/apps/dav/lib/Connector/Sabre/Principal.php b/apps/dav/lib/Connector/Sabre/Principal.php
index ca98d455b3..a441e1c812 100644
--- a/apps/dav/lib/Connector/Sabre/Principal.php
+++ b/apps/dav/lib/Connector/Sabre/Principal.php
@@ -35,6 +35,7 @@
 namespace OCA\DAV\Connector\Sabre;
 
 use OCA\Circles\Exceptions\CircleDoesNotExistException;
+use OCP\App\IAppManager;
 use OCP\AppFramework\QueryException;
 use OCP\IConfig;
 use OCP\IGroup;
@@ -64,6 +65,9 @@ class Principal implements BackendInterface {
 	/** @var IConfig */
 	private $config;
 
+	/** @var IAppManager */
+	private $appManager;
+
 	/** @var string */
 	private $principalPrefix;
 
@@ -86,12 +90,14 @@ class Principal implements BackendInterface {
 								IShareManager $shareManager,
 								IUserSession $userSession,
 								IConfig $config,
+								IAppManager $appManager,
 								$principalPrefix = 'principals/users/') {
 		$this->userManager = $userManager;
 		$this->groupManager = $groupManager;
 		$this->shareManager = $shareManager;
 		$this->userSession = $userSession;
 		$this->config = $config;
+		$this->appManager = $appManager;
 		$this->principalPrefix = trim($principalPrefix, '/');
 		$this->hasGroups = $this->hasCircles = ($principalPrefix === 'principals/users/');
 	}
@@ -404,7 +410,7 @@ class Principal implements BackendInterface {
 	 * @suppress PhanUndeclaredClassCatch
 	 */
 	protected function circleToPrincipal($circleUniqueId) {
-		if (!\OC::$server->getAppManager()->isEnabledForUser('circles') || !class_exists('\OCA\Circles\Api\v1\Circles')) {
+		if (!$this->appManager->isEnabledForUser('circles') || !class_exists('\OCA\Circles\Api\v1\Circles')) {
 			return null;
 		}
 
@@ -438,7 +444,7 @@ class Principal implements BackendInterface {
 	 * @suppress PhanUndeclaredClassMethod
 	 */
 	public function getCircleMembership($principal):array {
-		if (!\OC::$server->getAppManager()->isEnabledForUser('circles') || !class_exists('\OCA\Circles\Api\v1\Circles')) {
+		if (!$this->appManager->isEnabledForUser('circles') || !class_exists('\OCA\Circles\Api\v1\Circles')) {
 			return [];
 		}
 
diff --git a/apps/dav/lib/RootCollection.php b/apps/dav/lib/RootCollection.php
index 9ad1ea5221..38c8b2f6b4 100644
--- a/apps/dav/lib/RootCollection.php
+++ b/apps/dav/lib/RootCollection.php
@@ -58,7 +58,8 @@ class RootCollection extends SimpleCollection {
 			$groupManager,
 			$shareManager,
 			\OC::$server->getUserSession(),
-			$config
+			$config,
+			\OC::$server->getAppManager()
 		);
 		$groupPrincipalBackend = new GroupPrincipalBackend($groupManager, $userSession, $shareManager, $l10n);
 		$calendarResourcePrincipalBackend = new ResourcePrincipalBackend($db, $userSession, $groupManager, $logger);
diff --git a/apps/dav/tests/unit/Connector/Sabre/PrincipalTest.php b/apps/dav/tests/unit/Connector/Sabre/PrincipalTest.php
index b72ae0a743..b40cd3105a 100644
--- a/apps/dav/tests/unit/Connector/Sabre/PrincipalTest.php
+++ b/apps/dav/tests/unit/Connector/Sabre/PrincipalTest.php
@@ -29,6 +29,7 @@
 namespace OCA\DAV\Tests\unit\Connector\Sabre;
 
 use OC\User\User;
+use OCP\App\IAppManager;
 use OCP\IConfig;
 use OCP\IGroup;
 use OCP\IGroupManager;
@@ -59,19 +60,25 @@ class PrincipalTest extends TestCase {
 	/** @var IConfig | \PHPUnit_Framework_MockObject_MockObject  */
 	private $config;
 
+	/** @var IAppManager | \PHPUnit_Framework_MockObject_MockObject  */
+	private $appManager;
+
 	public function setUp() {
 		$this->userManager = $this->createMock(IUserManager::class);
 		$this->groupManager = $this->createMock(IGroupManager::class);
 		$this->shareManager = $this->createMock(IManager::class);
 		$this->userSession = $this->createMock(IUserSession::class);
 		$this->config = $this->createMock(IConfig::class);
+		$this->appManager = $this->createMock(IAppManager::class);
 
 		$this->connector = new \OCA\DAV\Connector\Sabre\Principal(
 			$this->userManager,
 			$this->groupManager,
 			$this->shareManager,
 			$this->userSession,
-			$this->config);
+			$this->config,
+			$this->appManager
+		);
 		parent::setUp();
 	}
 
diff --git a/apps/files_trashbin/lib/AppInfo/Application.php b/apps/files_trashbin/lib/AppInfo/Application.php
index 06a34e0df8..761298673a 100644
--- a/apps/files_trashbin/lib/AppInfo/Application.php
+++ b/apps/files_trashbin/lib/AppInfo/Application.php
@@ -61,7 +61,8 @@ class Application extends App {
 				\OC::$server->getGroupManager(),
 				\OC::$server->getShareManager(),
 				\OC::$server->getUserSession(),
-				\OC::$server->getConfig()
+				\OC::$server->getConfig(),
+				\OC::$server->getAppManager()
 			);
 		});
 
diff --git a/apps/files_versions/lib/AppInfo/Application.php b/apps/files_versions/lib/AppInfo/Application.php
index 935556221f..45dc6da6e2 100644
--- a/apps/files_versions/lib/AppInfo/Application.php
+++ b/apps/files_versions/lib/AppInfo/Application.php
@@ -51,7 +51,8 @@ class Application extends App {
 				$server->getGroupManager(),
 				$server->getShareManager(),
 				$server->getUserSession(),
-				$server->getConfig()
+				$server->getConfig(),
+				$server->getAppManager()
 			);
 		});