diff --git a/apps/files_sharing/lib/External/MountProvider.php b/apps/files_sharing/lib/External/MountProvider.php
index f46bb009ab..3f2f39a74f 100644
--- a/apps/files_sharing/lib/External/MountProvider.php
+++ b/apps/files_sharing/lib/External/MountProvider.php
@@ -56,6 +56,7 @@ class MountProvider implements IMountProvider {
 		$mountPoint = '/' . $user->getUID() . '/files/' . ltrim($data['mountpoint'], '/');
 		$data['mountpoint'] = $mountPoint;
 		$data['certificateManager'] = \OC::$server->getCertificateManager($user->getUID());
+		$data['HttpClientService'] = \OC::$server->getHTTPClientService();
 		return new Mount(self::STORAGE, $mountPoint, $data, $manager, $storageFactory);
 	}
 
diff --git a/apps/files_sharing/lib/External/Storage.php b/apps/files_sharing/lib/External/Storage.php
index caa2bcf2a7..93f3571e80 100644
--- a/apps/files_sharing/lib/External/Storage.php
+++ b/apps/files_sharing/lib/External/Storage.php
@@ -64,10 +64,10 @@ class Storage extends DAV implements ISharedStorage {
 
 	public function __construct($options) {
 		$this->memcacheFactory = \OC::$server->getMemCacheFactory();
-		$this->httpClient = \OC::$server->getHTTPClientService();
+		$this->httpClient = $options['HttpClientService'];
 		$discoveryManager = new DiscoveryManager(
 			$this->memcacheFactory,
-			\OC::$server->getHTTPClientService()
+			$this->httpClient
 		);
 
 		$this->manager = $options['manager'];
diff --git a/apps/files_sharing/tests/ExternalStorageTest.php b/apps/files_sharing/tests/ExternalStorageTest.php
index e84d2bb0e1..49b72be139 100644
--- a/apps/files_sharing/tests/ExternalStorageTest.php
+++ b/apps/files_sharing/tests/ExternalStorageTest.php
@@ -25,6 +25,9 @@
  */
 
 namespace OCA\Files_Sharing\Tests;
+use OCP\Http\Client\IClient;
+use OCP\Http\Client\IClientService;
+use OCP\Http\Client\IResponse;
 
 /**
  * Tests for the external Storage class for remote shares.
@@ -69,6 +72,22 @@ class ExternalStorageTest extends \Test\TestCase {
 
 	private function getTestStorage($uri) {
 		$certificateManager = \OC::$server->getCertificateManager();
+		$httpClientService = $this->createMock(IClientService::class);
+		$client = $this->createMock(IClient::class);
+		$response = $this->createMock(IResponse::class);
+		$client
+			->expects($this->any())
+			->method('get')
+			->willReturn($response);
+		$client
+			->expects($this->any())
+			->method('post')
+			->willReturn($response);
+		$httpClientService
+			->expects($this->any())
+			->method('newClient')
+			->willReturn($client);
+
 		return new TestSharingExternalStorage(
 			array(
 				'remote' => $uri,
@@ -77,7 +96,8 @@ class ExternalStorageTest extends \Test\TestCase {
 				'token' => 'abcdef',
 				'password' => '',
 				'manager' => null,
-				'certificateManager' => $certificateManager
+				'certificateManager' => $certificateManager,
+				'HttpClientService' => $httpClientService,
 			)
 		);
 	}