diff --git a/patches/014-add-mail-usage.patch b/patches/014-add-mail-usage.patch
index ca86e28f93a345042ff6685d8900476ea3acefd6..0283a63b5d9f01e5128bdd671114372ced002daa 100644
--- a/patches/014-add-mail-usage.patch
+++ b/patches/014-add-mail-usage.patch
@@ -29,7 +29,7 @@
  			} else {
  				$free = $this->storage->free_space($path);
 -				$quotaFree = max($this->getQuota() - $used, 0);
-+				$ownerId = $this->storage->getUser()->getUID();
++				$ownerId = $this->storage->getOwner($path);
 +				$mailQuotaUsage = (int) \OC::$server->getConfig()->getUserValue($ownerId, 'ecloud-accounts', 'mailQuotaUsage', 0);
 +				$mailQuotaUsage = max($mailQuotaUsage, 0); // to avoid negative mail quota usage value
 +				$quotaFree = max($this->getQuota() - $used - $mailQuotaUsage, 0);