diff --git a/docs-xml/smbdotconf/base/doscharset.xml b/docs-xml/smbdotconf/base/doscharset.xml
index 4b5872ce382..f8d5432b025 100644
--- a/docs-xml/smbdotconf/base/doscharset.xml
+++ b/docs-xml/smbdotconf/base/doscharset.xml
@@ -2,6 +2,7 @@
 				 type="string"
                  context="G"
                  advanced="1" developer="1"
+                 constant="1"
 				 xmlns:samba="http://www.samba.org/samba/DTD/samba-doc">
 <description>
         <para>DOS SMB clients assume the server has