diff --git a/opm/parser/eclipse/EclipseState/EclipseState.hpp b/opm/parser/eclipse/EclipseState/EclipseState.hpp
index 2a74c182c..87122f485 100644
--- a/opm/parser/eclipse/EclipseState/EclipseState.hpp
+++ b/opm/parser/eclipse/EclipseState/EclipseState.hpp
@@ -126,7 +126,7 @@ namespace Opm {
             m_inputEditNnc.serializeOp(serializer);
             m_gridDims.serializeOp(serializer);
             m_simulationConfig.serializeOp(serializer);
-            serializer(m_transMult);
+            m_transMult.serializeOp(serializer);
             serializer(m_faults);
             serializer(m_title);
             serializer(aquifer_config);
diff --git a/opm/parser/eclipse/EclipseState/Grid/TransMult.hpp b/opm/parser/eclipse/EclipseState/Grid/TransMult.hpp
index 7bb0efe88..6ba859562 100644
--- a/opm/parser/eclipse/EclipseState/Grid/TransMult.hpp
+++ b/opm/parser/eclipse/EclipseState/Grid/TransMult.hpp
@@ -68,6 +68,17 @@ namespace Opm {
 
         bool operator==(const TransMult& data) const;
 
+        template<class Serializer>
+        void serializeOp(Serializer& serializer)
+        {
+            serializer(m_nx);
+            serializer(m_ny);
+            serializer(m_nz);
+            serializer(m_trans);
+            serializer(m_names);
+            m_multregtScanner.serializeOp(serializer);
+        }
+
     private:
         size_t getGlobalIndex(size_t i , size_t j , size_t k) const;
         void assertIJK(size_t i , size_t j , size_t k) const;