diff --git a/opm/parser/eclipse/EclipseState/Schedule/Group/GConSale.hpp b/opm/parser/eclipse/EclipseState/Schedule/Group/GConSale.hpp
index 48fea6d6b..6aa5b29e1 100644
--- a/opm/parser/eclipse/EclipseState/Schedule/Group/GConSale.hpp
+++ b/opm/parser/eclipse/EclipseState/Schedule/Group/GConSale.hpp
@@ -52,6 +52,17 @@ namespace Opm {
                        udq_undefined == data.udq_undefined &&
                        unit_system == data.unit_system;
             }
+
+            template<class Serializer>
+            void serializeOp(Serializer& serializer)
+            {
+                sales_target.serializeOp(serializer);
+                max_sales_rate.serializeOp(serializer);
+                min_sales_rate.serializeOp(serializer);
+                serializer(max_proc);
+                serializer(udq_undefined);
+                unit_system.serializeOp(serializer);
+            }
         };
 
         struct GCONSALEGroupProp {
@@ -75,6 +86,12 @@ namespace Opm {
 
         bool operator==(const GConSale& data) const;
 
+        template<class Serializer>
+        void serializeOp(Serializer& serializer)
+        {
+            serializer.map(groups);
+        }
+
     private:
         std::map<std::string, GCONSALEGroup> groups;
     };
diff --git a/opm/parser/eclipse/EclipseState/Schedule/Schedule.hpp b/opm/parser/eclipse/EclipseState/Schedule/Schedule.hpp
index a3098bd53..39e3c705b 100644
--- a/opm/parser/eclipse/EclipseState/Schedule/Schedule.hpp
+++ b/opm/parser/eclipse/EclipseState/Schedule/Schedule.hpp
@@ -306,7 +306,7 @@ namespace Opm
             udq_config.serializeOp(serializer);
             udq_active.serializeOp(serializer);
             guide_rate_config.serializeOp(serializer);
-            serializer(gconsale);
+            gconsale.serializeOp(serializer);
             serializer(gconsump);
             serializer(global_whistctl_mode);
             serializer(m_actions);