diff --git a/language/types/type-juggling.xml b/language/types/type-juggling.xml
index 0c87f7200554..fd6e2cfac8c1 100644
--- a/language/types/type-juggling.xml
+++ b/language/types/type-juggling.xml
@@ -250,7 +250,7 @@
 
    <example>
     <title>Example of types being coerced into a type part of the union</title>
-    <programlisting>
+    <programlisting role="php">
 <![CDATA[
 <?php
 // int|string