diff --git a/gtk/gtkuimanager.c b/gtk/gtkuimanager.c
index 40ffc3cd28..5108fa3b19 100644
--- a/gtk/gtkuimanager.c
+++ b/gtk/gtkuimanager.c
@@ -123,7 +123,7 @@
  *
  * <example>
  * <title>A UI definition</title>
- * <programlisting>
+ * <programlisting><![CDATA[
  * <ui>
  *   <menubar>
  *     <menu name="FileMenu" action="FileMenuAction">
@@ -148,7 +148,7 @@
  *     </placeholder>
  *   </toolbar>
  * </ui>
- * </programlisting>
+ * ]]></programlisting>
  * </example>
  *
  * The constructed widget hierarchy is very similar to the element tree