diff --git a/include/teqp/models/pcsaft.hpp b/include/teqp/models/pcsaft.hpp
index 13b8deb75e5188736b910da7f89a5e83d36a33c1..48b645ffe29b465278629a4d5f8efc30b5cad827 100644
--- a/include/teqp/models/pcsaft.hpp
+++ b/include/teqp/models/pcsaft.hpp
@@ -1,6 +1,7 @@
 #pragma once
 
 #include "nlohmann/json.hpp"
+#include "teqp/types.hpp"
 #include "teqp/exceptions.hpp"
 #include "teqp/constants.hpp"