diff --git a/Tests/ParserTest.php b/Tests/ParserTest.php
index cdd37ed4..5b3395b0 100644
--- a/Tests/ParserTest.php
+++ b/Tests/ParserTest.php
@@ -1777,7 +1777,7 @@ public function testParseMultiLineUnquotedStringWithTrailingComment(string $yaml
         $this->assertSame($expected, $this->parser->parse($yaml));
     }
 
-    public function unquotedStringWithTrailingComment()
+    public static function unquotedStringWithTrailingComment()
     {
         return [
             'comment after comma' => [