diff --git a/language/control-structures.xml b/language/control-structures.xml
index dfe663e8d4..1a2771f134 100644
--- a/language/control-structures.xml
+++ b/language/control-structures.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.149 $ -->
+<!-- $Revision: 1.150 $ -->
  <chapter xml:id="language.control-structures" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
   <title>Control Structures</title>
 
@@ -1659,8 +1659,8 @@ function get_include_contents($filename) {
        <programlisting role="php">
 <![CDATA[
 <?php
-require_once("a.php"); // this will include a.php
-require_once("A.php"); // this will include a.php again on Windows! (PHP 4 only)
+require_once "a.php"; // this will include a.php
+require_once "A.php"; // this will include a.php again on Windows! (PHP 4 only)
 ?>
 ]]>
         </programlisting>
@@ -1726,8 +1726,8 @@ require_once("A.php"); // this will include a.php again on Windows! (PHP 4 only)
        <programlisting role="php">
 <![CDATA[
 <?php
-include_once("a.php"); // this will include a.php
-include_once("A.php"); // this will include a.php again on Windows! (PHP 4 only)
+include_once "a.php"; // this will include a.php
+include_once "A.php"; // this will include a.php again on Windows! (PHP 4 only)
 ?>
 ]]>
         </programlisting>