diff --git a/reference/strings/functions/sprintf.xml b/reference/strings/functions/sprintf.xml
index 04aecaf4c4..cfeb2c89ed 100644
--- a/reference/strings/functions/sprintf.xml
+++ b/reference/strings/functions/sprintf.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.15 $ -->
+<!-- $Revision: 1.16 $ -->
 <!-- splitted from ./en/functions/strings.xml, last change in rev 1.2 -->
   <refentry id="function.sprintf">
    <refnamediv>
@@ -143,7 +143,7 @@
       <programlisting role="php">
 <![CDATA[
 <?php
-$format = "There are %d monkeys in the %s";
+$format = 'There are %d monkeys in the %s';
 printf($format, $num, $location);
 ?>
 ]]>
@@ -158,7 +158,7 @@ printf($format, $num, $location);
       <programlisting role="php">
 <![CDATA[
 <?php
-$format = "The %s contains %d monkeys";
+$format = 'The %s contains %d monkeys';
 printf($format, $num, $location);
 ?>
 ]]>
@@ -174,7 +174,7 @@ printf($format, $num, $location);
       <programlisting role="php">
 <![CDATA[
 <?php
-$format = "The %2\$s contains %1\$d monkeys";
+$format = 'The %2$s contains %1$d monkeys';
 printf($format, $num, $location);
 ?>
 ]]>
@@ -187,8 +187,8 @@ printf($format, $num, $location);
       <programlisting role="php">
 <![CDATA[
 <?php
-$format = "The %2\$s contains %1\$d monkeys.
-           That's a nice %2\$s full of %1\$d monkeys.";
+$format = 'The %2$s contains %1$d monkeys.
+           That\'s a nice %2$s full of %1$d monkeys.';
 printf($format, $num, $location);
 ?>
 ]]>