diff --git a/reference/pdo/constants.xml b/reference/pdo/constants.xml
index c774484226..e8bd66a3e2 100644
--- a/reference/pdo/constants.xml
+++ b/reference/pdo/constants.xml
@@ -1,5 +1,5 @@
 <?xml version='1.0' encoding='iso-8859-1'?>
-<!-- $Revision: 1.16 $ -->
+<!-- $Revision: 1.17 $ -->
 <!-- Generated by xml_proto.php v2.1. Found in /scripts directory of phpdoc. -->
 <section id="pdo.constants">
  &reftitle.constants;
@@ -630,7 +630,7 @@ if ($db->getAttribute(PDO::ATTR_DRIVER_NAME) == 'mysql') {
   </varlistentry>
   <varlistentry>
    <term>
-    <constant>PDO::PDO_NULL_NATURAL</constant>
+    <constant>PDO::NULL_NATURAL</constant>
      (<type>integer</type>)
    </term>
    <listitem>
@@ -641,7 +641,7 @@ if ($db->getAttribute(PDO::ATTR_DRIVER_NAME) == 'mysql') {
   </varlistentry>
   <varlistentry>
    <term>
-    <constant>PDO::PDO_NULL_EMPTY_STRING</constant>
+    <constant>PDO::NULL_EMPTY_STRING</constant>
      (<type>integer</type>)
    </term>
    <listitem>
@@ -652,7 +652,7 @@ if ($db->getAttribute(PDO::ATTR_DRIVER_NAME) == 'mysql') {
   </varlistentry>
   <varlistentry>
    <term>
-    <constant>PDO::PDO_NULL_TO_STRING</constant>
+    <constant>PDO::NULL_TO_STRING</constant>
      (<type>integer</type>)
    </term>
    <listitem>