diff --git a/utilities/xmlrpcpp/include/xmlrpcpp/XmlRpcValue.h b/utilities/xmlrpcpp/include/xmlrpcpp/XmlRpcValue.h
index 50d3c478e8..0d72c59cf9 100644
--- a/utilities/xmlrpcpp/include/xmlrpcpp/XmlRpcValue.h
+++ b/utilities/xmlrpcpp/include/xmlrpcpp/XmlRpcValue.h
@@ -189,7 +189,7 @@ namespace XmlRpc {
 } // namespace XmlRpc
 
 
-std::ostream& operator<<(std::ostream& os, const XmlRpc::XmlRpcValue& v);
+std::ostream& operator<<(std::ostream& os, XmlRpc::XmlRpcValue& v);
 
 
 #endif // _XMLRPCVALUE_H_
diff --git a/utilities/xmlrpcpp/src/XmlRpcValue.cpp b/utilities/xmlrpcpp/src/XmlRpcValue.cpp
index 029337a87d..d4eb54d4aa 100644
--- a/utilities/xmlrpcpp/src/XmlRpcValue.cpp
+++ b/utilities/xmlrpcpp/src/XmlRpcValue.cpp
@@ -653,10 +653,10 @@ namespace XmlRpc {
 
 
 // ostream
-std::ostream& operator<<(std::ostream& os, const XmlRpc::XmlRpcValue& v)
-{
+std::ostream& operator<<(std::ostream& os, XmlRpc::XmlRpcValue& v) 
+{ 
   // If you want to output in xml format:
-  //return os << v.toXml();
+  //return os << v.toXml(); 
   return v.write(os);
 }