diff --git a/test/phpunit/WebsiteTest.php b/test/phpunit/WebsiteTest.php
index 2f0afbbed96..a20a18dd987 100644
--- a/test/phpunit/WebsiteTest.php
+++ b/test/phpunit/WebsiteTest.php
@@ -105,7 +105,7 @@ class WebsiteTest extends PHPUnit\Framework\TestCase
 	 *
 	 * @return void
 	 */
-	public static function setUpBeforeClass()
+	public static function setUpBeforeClass(): void
 	{
 		global $conf,$user,$langs,$db;
 		$db->begin();	// This is to have all actions inside a transaction even if test launched without suite.
@@ -118,7 +118,7 @@ class WebsiteTest extends PHPUnit\Framework\TestCase
 	 *
 	 * @return	void
 	 */
-	public static function tearDownAfterClass()
+	public static function tearDownAfterClass(): void
 	{
 		global $conf,$user,$langs,$db;
 		$db->rollback();
@@ -131,7 +131,7 @@ class WebsiteTest extends PHPUnit\Framework\TestCase
 	 *
 	 * @return	void
 	 */
-	protected function setUp()
+	protected function setUp(): void
 	{
 		global $conf,$user,$langs,$db;
 		$conf=$this->savconf;
@@ -147,7 +147,7 @@ class WebsiteTest extends PHPUnit\Framework\TestCase
 	 *
 	 * @return	void
 	 */
-	protected function tearDown()
+	protected function tearDown(): void
 	{
 		print __METHOD__."\n";
 	}