diff --git a/Cantera/src/transport/TransportFactory.cpp b/Cantera/src/transport/TransportFactory.cpp
index 305979217..dae5fd0f9 100755
--- a/Cantera/src/transport/TransportFactory.cpp
+++ b/Cantera/src/transport/TransportFactory.cpp
@@ -28,6 +28,7 @@
 #include "MMCollisionInt.h"
 #include <stdio.h>
 #include "../xml.h"
+#include "../XML_Writer.h"
 #include "TransportParams.h"
 #include "../global.h"
 #include "../IdealGasPhase.h"