diff --git a/apps/settings/lib/Settings/Personal/PersonalInfo.php b/apps/settings/lib/Settings/Personal/PersonalInfo.php
index c4b505c424..afadc3c775 100644
--- a/apps/settings/lib/Settings/Personal/PersonalInfo.php
+++ b/apps/settings/lib/Settings/Personal/PersonalInfo.php
@@ -105,6 +105,9 @@ class PersonalInfo implements ISettings {
 		$user = $this->userManager->get($uid);
 		$userData = $this->accountManager->getUser($user);
 
+		// make sure FS is setup before querying storage related stuff...
+		\OC_Util::setupFS($user->getUID());
+
 		$storageInfo = \OC_Helper::getStorageInfo('/');
 		if ($storageInfo['quota'] === FileInfo::SPACE_UNLIMITED) {
 			$totalSpace = $this->l->t('Unlimited');
diff --git a/lib/private/legacy/OC_Helper.php b/lib/private/legacy/OC_Helper.php
index 0d39a82e51..44fbdffc09 100644
--- a/lib/private/legacy/OC_Helper.php
+++ b/lib/private/legacy/OC_Helper.php
@@ -475,6 +475,9 @@ class OC_Helper {
 	/**
 	 * Calculate the disc space for the given path
 	 *
+	 * BEWARE: this requires that Util::setupFS() was called
+	 * already !
+	 *
 	 * @param string $path
 	 * @param \OCP\Files\FileInfo $rootInfo (optional)
 	 * @return array