diff --git a/reference/dio/constants.xml b/reference/dio/constants.xml
index 27f4fb4974..921c92c342 100644
--- a/reference/dio/constants.xml
+++ b/reference/dio/constants.xml
@@ -1,18 +1,9 @@
 <?xml version='1.0' encoding='iso-8859-1'?>
-<!-- $Revision: 1.3 $ -->
+<!-- $Revision: 1.4 $ -->
 <appendix xml:id="dio.constants" xmlns="http://docbook.org/ns/docbook">
  &reftitle.constants;
  &extension.constants;
  <variablelist>
-  <varlistentry>
-   <term>
-    <constant>c</constant>
-    (<type>integer</type>)
-   </term>
-   <listitem>
-    <para></para>
-   </listitem>
-  </varlistentry>
   <varlistentry>
    <term>
     <constant>F_DUPFD</constant>