diff --git a/Cantera/src/transport/TransportParams.h b/Cantera/src/transport/TransportParams.h
index 48bd5c279..0a5ba5a01 100755
--- a/Cantera/src/transport/TransportParams.h
+++ b/Cantera/src/transport/TransportParams.h
@@ -7,6 +7,7 @@ using namespace std;
 #include "../ct_defs.h"
 #include "TransportBase.h"
 #include "../xml.h"
+#include "../XML_Writer.h"
 
 namespace Cantera {