diff --git a/opm/simulators/flow/Main.hpp b/opm/simulators/flow/Main.hpp
index 4f5fb5c4f6..504369e0d6 100644
--- a/opm/simulators/flow/Main.hpp
+++ b/opm/simulators/flow/Main.hpp
@@ -25,6 +25,7 @@
 
 #include <opm/input/eclipse/EclipseState/EclipseState.hpp>
 #include <opm/input/eclipse/Schedule/Action/State.hpp>
+#include <opm/input/eclipse/Schedule/UDQ/UDQState.hpp>
 
 #include <opm/models/utils/propertysystem.hh>
 #include <opm/models/utils/parametersystem.hpp>