1 files changed, 1 insertions, 1 deletions

diff --git a/tests/legacy/LegacyLinkFilterTest.php b/tests/legacy/LegacyLinkFilterTest.php
index ba9ec529..8223cc15 100644
--- a/tests/legacy/LegacyLinkFilterTest.php
+++ b/tests/legacy/LegacyLinkFilterTest.php
@@ -34,7 +34,7 @@ class LegacyLinkFilterTest extends \PHPUnit\Framework\TestCase
     /**
      * Instantiate linkFilter with ReferenceLinkDB data.
      */
-    public static function setUpBeforeClass()
+    public static function setUpBeforeClass(): void
     {
         self::$refDB = new ReferenceLinkDB(true);
         self::$refDB->write(self::$testDatastore);