diff --git a/lib/Middleware/SessionMiddleware.php b/lib/Middleware/SessionMiddleware.php
index e7d18819fcf..ae95b7839c2 100644
--- a/lib/Middleware/SessionMiddleware.php
+++ b/lib/Middleware/SessionMiddleware.php
@@ -147,7 +147,7 @@ private function assertUserOrShareToken(ISessionAwareController $controller): vo
 				}
 			}
 
-			if (!($share->getPermissions() & Constants::PERMISSION_READ)) {
+			if ($share->getPermissions() & Constants::PERMISSION_READ !== Constants::PERMISSION_READ) {
 				throw new InvalidSessionException();
 			}