diff --git a/examples/compute_initial_state.cpp b/examples/compute_initial_state.cpp
index a2b8c2ed8..356f3f42d 100644
--- a/examples/compute_initial_state.cpp
+++ b/examples/compute_initial_state.cpp
@@ -36,6 +36,8 @@
 
 #include <boost/filesystem.hpp>
 
+#include <fstream>
+
 namespace
 {
     void warnIfUnusedParams(const Opm::parameter::ParameterGroup& param)