diff --git a/test/phpunit/FilesLibTest.php b/test/phpunit/FilesLibTest.php
index 05dd9bf3954..ae8ea17efb6 100644
--- a/test/phpunit/FilesLibTest.php
+++ b/test/phpunit/FilesLibTest.php
@@ -82,7 +82,7 @@ class FilesLibTest extends PHPUnit\Framework\TestCase
      *
      * @return void
      */
-    public static function setUpBeforeClass(): void
+    public static function setUpBeforeClass()
     {
     	global $conf,$user,$langs,$db;
 		$db->begin();	// This is to have all actions inside a transaction even if test launched without suite.
@@ -95,7 +95,7 @@ class FilesLibTest extends PHPUnit\Framework\TestCase
      *
      * @return	void
      */
-    public static function tearDownAfterClass(): void
+    public static function tearDownAfterClass()
     {
     	global $conf,$user,$langs,$db;
 		$db->rollback();
@@ -108,7 +108,7 @@ class FilesLibTest extends PHPUnit\Framework\TestCase
 	 *
 	 * @return	void
 	 */
-    protected function setUp(): void
+    protected function setUp()
     {
     	global $conf,$user,$langs,$db;
 		$conf=$this->savconf;
@@ -123,7 +123,7 @@ class FilesLibTest extends PHPUnit\Framework\TestCase
 	 *
 	 * @return	void
 	 */
-    protected function tearDown(): void
+    protected function tearDown()
     {
     	print __METHOD__."\n";
     }