diff --git a/lib/private/legacy/app.php b/lib/private/legacy/app.php
index c2ff9a5be3c07b344c066238bcc32ff22560252f..0d9adfa9d2bf7d070a7b0c58f51cc14b3dcba410 100644
--- a/lib/private/legacy/app.php
+++ b/lib/private/legacy/app.php
@@ -376,6 +376,8 @@ class OC_App {
 				$config,
 				$l
 			);
+			$appPath = self::getAppPath($appId);
+			self::registerAutoloading($appId, $appPath);
 			$installer->installApp($appId);
 		} else {
 			// check for required dependencies