diff --git a/components/expression_language/caching.rst b/components/expression_language/caching.rst
index f7de6fb9066..150bf265fbf 100644
--- a/components/expression_language/caching.rst
+++ b/components/expression_language/caching.rst
@@ -65,7 +65,7 @@ Both ``evaluate()`` and ``compile()`` can handle ``ParsedExpression`` and
 
     $expression = new SerializedParsedExpression(
         '1 + 4',
-        serialize($language->parse('1 + 4', array()))
+        serialize($language->parse('1 + 4', array())->getNodes())
     );
 
     echo $language->evaluate($expression); // prints 5