diff --git a/include/teqp/models/multifluid.hpp b/include/teqp/models/multifluid.hpp
index 025563fd98d60ac78011b85b5c4a59a80cfcac94..fb37ff62cd3f3bd19b9b58753d9e1f21ed84feeb 100644
--- a/include/teqp/models/multifluid.hpp
+++ b/include/teqp/models/multifluid.hpp
@@ -9,7 +9,9 @@
 #include <optional>
 #include <variant>
 
+#include "teqp/derivs.hpp"
 #include "teqp/types.hpp"
+
 #include "MultiComplex/MultiComplex.hpp"
 
 #include "multifluid_eosterms.hpp"