diff --git a/tests/phpunit/tests/html-api/wpHtmlProcessor-serialize.php b/tests/phpunit/tests/html-api/wpHtmlProcessor-serialize.php
index f2e76dbaeae29..4fa46d3cabc2f 100644
--- a/tests/phpunit/tests/html-api/wpHtmlProcessor-serialize.php
+++ b/tests/phpunit/tests/html-api/wpHtmlProcessor-serialize.php
@@ -243,7 +243,7 @@ public function data_bogus_comments() {
 			'CDATA look-alike'                      => array( '<!', '[CDATA[inside]]', '>' ),
 			'Immediately-closed markup instruction' => array( '<!', '?', '>' ),
 			'Warning Symbol'                        => array( '<!', '', '>' ),
-			'PHP block look-alike'                  => array( '<?', 'php foo(); ?', '>' ),
+			'PHP block look-alike'                  => array( '<', '?php foo(); ?', '>' ),
 			'Funky comment'                         => array( '</', '%display-name', '>' ),
 			'XML Processing Instruction look-alike' => array( '<', '?xml foo ', '>' ),
 		);