diff --git a/apps/files_external/lib/config/configadapter.php b/apps/files_external/lib/config/configadapter.php
index 4e37e6a400..4f68c3c7fd 100644
--- a/apps/files_external/lib/config/configadapter.php
+++ b/apps/files_external/lib/config/configadapter.php
@@ -114,7 +114,7 @@ class ConfigAdapter implements IMountProvider {
 	 * @return \OCP\Files\Mount\IMountPoint[]
 	 */
 	public function getMountsForUser(IUser $user, IStorageFactory $loader) {
-		$this->migrator->migrateUser();
+		$this->migrator->migrateUser($user);
 
 		$mounts = [];
 
diff --git a/apps/files_external/migration/dummyusersession.php b/apps/files_external/migration/dummyusersession.php
new file mode 100644
index 0000000000..9ffbfd6309
--- /dev/null
+++ b/apps/files_external/migration/dummyusersession.php
@@ -0,0 +1,51 @@
+<?php
+/**
+ * @author Robin Appelman <icewind@owncloud.com>
+ *
+ * @copyright Copyright (c) 2015, ownCloud, Inc.
+ * @license AGPL-3.0
+ *
+ * This code is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3,
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License, version 3,
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *
+ */
+
+namespace OCA\Files_external\Migration;
+
+use OCP\IUser;
+use OCP\IUserSession;
+
+class DummyUserSession implements IUserSession {
+
+	/**
+	 * @var IUser
+	 */
+	private $user;
+
+	public function login($user, $password) {
+	}
+
+	public function logout() {
+	}
+
+	public function setUser($user) {
+		$this->user = $user;
+	}
+
+	public function getUser() {
+		return $this->user;
+	}
+
+	public function isLoggedIn() {
+		return !is_null($this->user);
+	}
+}
diff --git a/apps/files_external/migration/storagemigrator.php b/apps/files_external/migration/storagemigrator.php
index c8e323121e..b469205ac5 100644
--- a/apps/files_external/migration/storagemigrator.php
+++ b/apps/files_external/migration/storagemigrator.php
@@ -32,6 +32,7 @@ use OCA\Files_external\Service\UserStoragesService;
 use OCP\IConfig;
 use OCP\IDBConnection;
 use OCP\ILogger;
+use OCP\IUser;
 use OCP\IUserSession;
 
 /**
@@ -48,11 +49,6 @@ class StorageMigrator {
 	 */
 	private $dbConfig;
 
-	/**
-	 * @var IUserSession
-	 */
-	private $userSession;
-
 	/**
 	 * @var IConfig
 	 */
@@ -73,7 +69,6 @@ class StorageMigrator {
 	 *
 	 * @param BackendService $backendService
 	 * @param DBConfigService $dbConfig
-	 * @param IUserSession $userSession
 	 * @param IConfig $config
 	 * @param IDBConnection $connection
 	 * @param ILogger $logger
@@ -81,14 +76,12 @@ class StorageMigrator {
 	public function __construct(
 		BackendService $backendService,
 		DBConfigService $dbConfig,
-		IUserSession $userSession,
 		IConfig $config,
 		IDBConnection $connection,
 		ILogger $logger
 	) {
 		$this->backendService = $backendService;
 		$this->dbConfig = $dbConfig;
-		$this->userSession = $userSession;
 		$this->config = $config;
 		$this->connection = $connection;
 		$this->logger = $logger;
@@ -121,14 +114,18 @@ class StorageMigrator {
 
 	/**
 	 * Migrate personal storages configured by the current user
+	 *
+	 * @param IUser $user
 	 */
-	public function migrateUser() {
-		$userId = $this->userSession->getUser()->getUID();
+	public function migrateUser(IUser $user) {
+		$dummySession = new DummyUserSession();
+		$dummySession->setUser($user);
+		$userId = $user->getUID();
 		$userVersion = $this->config->getUserValue($userId, 'files_external', 'config_version', '0.0.0');
 		if (version_compare($userVersion, '0.5.0', '<')) {
 			$this->config->setUserValue($userId, 'files_external', 'config_version', '0.5.0');
-			$legacyService = new UserLegacyStoragesService($this->backendService, $this->userSession);
-			$storageService = new UserStoragesService($this->backendService, $this->dbConfig, $this->userSession);
+			$legacyService = new UserLegacyStoragesService($this->backendService, $dummySession);
+			$storageService = new UserStoragesService($this->backendService, $this->dbConfig, $dummySession);
 
 			$this->migrate($legacyService, $storageService);
 		}