diff --git a/apps/settings/lib/Controller/UsersController.php b/apps/settings/lib/Controller/UsersController.php
index 6be93d6a3a..3a43442bda 100644
--- a/apps/settings/lib/Controller/UsersController.php
+++ b/apps/settings/lib/Controller/UsersController.php
@@ -484,7 +484,7 @@ protected function saveUserSettings(IAccount $userAccount): void {
 
 		$oldEmailAddress = $userAccount->getUser()->getSystemEMailAddress();
 		$oldEmailAddress = strtolower((string)$oldEmailAddress);
-		if ($oldEmailAddress !== $userAccount->getProperty(IAccountManager::PROPERTY_EMAIL)->getValue()) {
+		if ($oldEmailAddress !== strtolower($userAccount->getProperty(IAccountManager::PROPERTY_EMAIL)->getValue())) {
 			// this is the only permission a backend provides and is also used
 			// for the permission of setting a email address
 			if (!$userAccount->getUser()->canChangeDisplayName()) {