diff --git a/components/phpunit_bridge.rst b/components/phpunit_bridge.rst
index 934c425d368..cb77a1e376f 100644
--- a/components/phpunit_bridge.rst
+++ b/components/phpunit_bridge.rst
@@ -500,7 +500,7 @@ is mocked so it uses the mocked time if no timestamp is specified.
 Other functions with an optional timestamp parameter that defaults to ``time()``
 will still use the system time instead of the mocked time. This means that you
 may need to change some code in your tests. For example, instead of ``new DateTime()``,
-you should use ``DateTime::createFromFormat('U', time())`` to use the mocked
+you should use ``DateTime::createFromFormat('U', (string) time())`` to use the mocked
 ``time()`` function.
 
 To use the ``ClockMock`` class in your test, add the ``@group time-sensitive``