diff --git a/opm/core/simulator/SimulatorOutput.cpp b/opm/core/simulator/SimulatorOutput.cpp
index 9c794939..c94e6771 100644
--- a/opm/core/simulator/SimulatorOutput.cpp
+++ b/opm/core/simulator/SimulatorOutput.cpp
@@ -24,6 +24,8 @@
 #include <opm/core/io/OutputWriter.hpp>
 #include <opm/core/simulator/SimulatorTimer.hpp>
 
+#include <numeric> // partial_sum
+
 using namespace Opm;
 
 SimulatorOutputBase::SimulatorOutputBase (