diff --git a/lib/tests/filelib_test.php b/lib/tests/filelib_test.php
index bf6b6040592..cd4681fd55e 100644
--- a/lib/tests/filelib_test.php
+++ b/lib/tests/filelib_test.php
@@ -160,7 +160,7 @@ class core_filelib_testcase extends advanced_testcase {
         $this->assertInstanceOf('stdClass', $response);
         $this->assertSame('200', $response->status);
         $this->assertTrue(is_array($response->headers));
-        $this->assertMatchesRegularExpression('|^HTTP/1\.[01] 200 OK$|', rtrim($response->response_code));
+        $this->assertRegExp('|^HTTP/1\.[01] 200 OK$|', rtrim($response->response_code));
         $this->assertSame('done', $response->results);
         $this->assertSame('', $response->error);