3 files changed, 3 insertions, 3 deletions
diff --git a/tests/installer/database_helper_test.php b/tests/installer/database_helper_test.php
index ed355884f6..9ffdad3e03 100644
--- a/tests/installer/database_helper_test.php
+++ b/tests/installer/database_helper_test.php
@@ -18,7 +18,7 @@ class phpbb_installer_database_helper_test extends phpbb_test_case
 	 */
 	private $database_helper;
 
-	public function setUp()
+	public function setUp(): void
 	{
 		$filesystem = new \phpbb\filesystem\filesystem();
 		$phpbb_root_path = '';
diff --git a/tests/installer/installer_config_test.php b/tests/installer/installer_config_test.php
index 1193d7aee4..6fa8248b68 100644
--- a/tests/installer/installer_config_test.php
+++ b/tests/installer/installer_config_test.php
@@ -20,7 +20,7 @@ class phpbb_installer_config_test extends phpbb_test_case
 	 */
 	private $config;
 
-	public function setUp()
+	public function setUp(): void
 	{
 		$phpbb_root_path = __DIR__ . './../../phpBB/';
 		$filesystem = $this->createMock('\phpbb\filesystem\filesystem');
diff --git a/tests/installer/module_base_test.php b/tests/installer/module_base_test.php
index 71ec2b8db2..887d29f4c6 100644
--- a/tests/installer/module_base_test.php
+++ b/tests/installer/module_base_test.php
@@ -26,7 +26,7 @@ class module_base_test extends phpbb_test_case
 	 */
 	protected $container;
 
-	public function setUp()
+	public function setUp(): void
 	{
 		// DI container mock
 		$this->container = new phpbb_mock_container_builder();