diff --git a/include/cantera/oneD/refine.h b/include/cantera/oneD/refine.h
index 2cc47adeb..2d6cfad95 100644
--- a/include/cantera/oneD/refine.h
+++ b/include/cantera/oneD/refine.h
@@ -1,6 +1,8 @@
 #ifndef CT_REFINE_H
 #define CT_REFINE_H
 
+#include "cantera/base/ct_defs.h"
+
 namespace Cantera
 {