diff --git a/conf/telemetry.xsd b/conf/telemetry.xsd
index b1c1c34983e5f441fdd685558869dd99b1da0dd4..3a2addbdce62850158121b710d15f1570179be99 100644
--- a/conf/telemetry.xsd
+++ b/conf/telemetry.xsd
@@ -104,8 +104,9 @@
            but it could also be referenced using idrefs. -->
       <xs:attribute name="id" type="xs:ID" />
       <xs:attribute name="numberofblocksoffset" type="xs:integer" default="0" />
-      <xs:attribute name="default" />
       <xs:attribute name="description" />
+      <!-- Use constvalue to defined the field as a constant -->
+      <xs:attribute name="constvalue" />
     </xs:complexType>
   </xs:element>
 
diff --git a/src/XmlConfig.cpp b/src/XmlConfig.cpp
index 38df4d5e99677d188a11bdd3624c1447ba33bcaa..f04cee524652ce50d9bf5b2eb9ce54a3789ebdad 100644
--- a/src/XmlConfig.cpp
+++ b/src/XmlConfig.cpp
@@ -148,12 +148,12 @@ void XmlConfig::_writeFields(xml_node parent, fstream& fs)
 		int nbits = atoi(typeStr.substr(spos, epos+1).c_str());
 		fs << nbits << endl;
 
-		xml_attribute defaultt = it->attribute("default");
-		if(!defaultt)
+		xml_attribute constvalue = it->attribute("constvalue");
+		if(!constvalue)
 			fs << "none" << endl;
 		else
 		{
-			bitset<64> x(atoi(defaultt.value()));
+			bitset<64> x(atoi(constvalue.value()));
 			fs << "0b" << x.to_string().substr(64-nbits, 64) << endl;
 		}
 		index++;