diff --git a/opm/parser/eclipse/EclipseState/Grid/MULTREGTScanner.hpp b/opm/parser/eclipse/EclipseState/Grid/MULTREGTScanner.hpp
index 420c1e6b5..2d16bb768 100644
--- a/opm/parser/eclipse/EclipseState/Grid/MULTREGTScanner.hpp
+++ b/opm/parser/eclipse/EclipseState/Grid/MULTREGTScanner.hpp
@@ -66,6 +66,17 @@ namespace Opm {
                    nnc_behaviour == data.nnc_behaviour &&
                    region_name == data.region_name;
         }
+
+        template<class Serializer>
+        void serializeOp(Serializer& serializer)
+        {
+            serializer(src_value);
+            serializer(target_value);
+            serializer(trans_mult);
+            serializer(directions);
+            serializer(nnc_behaviour);
+            serializer(region_name);
+        }
     };
 
     typedef std::map< std::pair<int , int> , const MULTREGTRecord * >  MULTREGTSearchMap;
@@ -100,6 +111,21 @@ namespace Opm {
         bool operator==(const MULTREGTScanner& data) const;
         MULTREGTScanner& operator=(const MULTREGTScanner& data);
 
+        template<class Serializer>
+        void serializeOp(Serializer& serializer)
+        {
+            serializer(nx);
+            serializer(ny);
+            serializer(nz);
+            serializer.vector(m_records);
+            ExternalSearchMap searchMap = getSearchMap();
+            serializer(searchMap);
+            if (m_searchMap.empty())
+                constructSearchMap(searchMap);
+            serializer(regions);
+            serializer(default_region);
+        }
+
     private:
         void constructSearchMap(const ExternalSearchMap& searchMap);