diff --git a/core/Controller/LoginController.php b/core/Controller/LoginController.php
index 4ec6d5c38c449..4c4a12355d22f 100644
--- a/core/Controller/LoginController.php
+++ b/core/Controller/LoginController.php
@@ -1,4 +1,7 @@
 <?php
+
+declare(strict_types=1);
+
 /**
  * @copyright Copyright (c) 2017, Sandro Lutz <sandro.lutz@temparus.ch>
  * @copyright Copyright (c) 2016 Joas Schilling <coding@schilljs.com>
@@ -227,7 +230,7 @@ private function setPasswordResetInitialState(?string $username): void {
 			$user = null;
 		}
 
-		$passwordLink = $this->config->getSystemValue('lost_password_link', '');
+		$passwordLink = $this->config->getSystemValueString('lost_password_link', '');
 
 		$this->initialStateService->provideInitialState(
 			'core',
diff --git a/tests/Core/Controller/LoginControllerTest.php b/tests/Core/Controller/LoginControllerTest.php
index b80fde008d557..fae20ae6b741b 100644
--- a/tests/Core/Controller/LoginControllerTest.php
+++ b/tests/Core/Controller/LoginControllerTest.php
@@ -1,4 +1,7 @@
 <?php
+
+declare(strict_types=1);
+
 /**
  * @author Lukas Reschke <lukas@owncloud.com>
  *
@@ -337,11 +340,16 @@ public function testShowLoginFormWithPasswordResetOption($canChangePassword,
 			->method('isLoggedIn')
 			->willReturn(false);
 		$this->config
-			->expects($this->exactly(2))
+			->expects(self::once())
 			->method('getSystemValue')
 			->willReturnMap([
 				['login_form_autocomplete', true, true],
-				['lost_password_link', '', false],
+			]);
+		$this->config
+			->expects(self::once())
+			->method('getSystemValueString')
+			->willReturnMap([
+				['lost_password_link', '', ''],
 			]);
 		$user = $this->createMock(IUser::class);
 		$user
@@ -386,11 +394,16 @@ public function testShowLoginFormForUserNamed0() {
 			->method('isLoggedIn')
 			->willReturn(false);
 		$this->config
-			->expects($this->exactly(2))
+			->expects(self::once())
 			->method('getSystemValue')
 			->willReturnMap([
 				['login_form_autocomplete', true, true],
-				['lost_password_link', '', false],
+			]);
+		$this->config
+			->expects(self::once())
+			->method('getSystemValueString')
+			->willReturnMap([
+				['lost_password_link', '', ''],
 			]);
 		$user = $this->createMock(IUser::class);
 		$user->expects($this->once())