diff --git a/opm/parser/eclipse/EclipseState/Summary/Summary.cpp b/opm/parser/eclipse/EclipseState/Summary/Summary.cpp
index 470a918ff..2dfe65cde 100644
--- a/opm/parser/eclipse/EclipseState/Summary/Summary.cpp
+++ b/opm/parser/eclipse/EclipseState/Summary/Summary.cpp
@@ -12,6 +12,9 @@
 
 #include <ert/ecl/ecl_smspec.h>
 
+#include <numeric>
+#include <array>
+
 namespace Opm {
 
     namespace fun {