diff --git a/opm/parser/eclipse/Deck/DeckView.hpp b/opm/parser/eclipse/Deck/DeckView.hpp
index fdac59934..979977bff 100644
--- a/opm/parser/eclipse/Deck/DeckView.hpp
+++ b/opm/parser/eclipse/Deck/DeckView.hpp
@@ -22,6 +22,8 @@
 
 #include <opm/parser/eclipse/Deck/DeckKeyword.hpp>
 
+#include <unordered_map>
+
 namespace Opm {