diff --git a/opm/simulators/wells/WGState.cpp b/opm/simulators/wells/WGState.cpp
index 118666fea..0af7fa5dd 100644
--- a/opm/simulators/wells/WGState.cpp
+++ b/opm/simulators/wells/WGState.cpp
@@ -32,10 +32,27 @@ WGState::WGState(const PhaseUsage& pu) :
     well_test_state{}
 {}
 
+WGState WGState::serializationTestObject(const ParallelWellInfo& pinfo)
+{
+    WGState result(PhaseUsage{});
+    result.well_state = WellState::serializationTestObject(pinfo);
+    result.group_state = GroupState::serializationTestObject();
+    result.well_test_state = WellTestState::serializationTestObject();
+
+    return result;
+}
+
 void WGState::wtest_state(WellTestState wtest_state)
 {
     wtest_state.filter_wells( this->well_state.wells() );
     this->well_test_state = std::move(wtest_state);
 }
 
+bool WGState::operator==(const WGState& rhs) const
+{
+    return this->well_state == rhs.well_state &&
+           this->group_state == rhs.group_state &&
+           this->well_test_state == rhs.well_test_state;
+}
+
 }
diff --git a/opm/simulators/wells/WGState.hpp b/opm/simulators/wells/WGState.hpp
index 28306ccef..446f5c836 100644
--- a/opm/simulators/wells/WGState.hpp
+++ b/opm/simulators/wells/WGState.hpp
@@ -26,20 +26,34 @@
 
 namespace Opm {
 
+class ParallelWellInfo;
+
 /*
-  Microscopic class to handle well , group and well test state.
+  Microscopic class to handle well, group and well test state.
 */
 
 struct PhaseUsage;
 
 struct WGState {
     WGState(const PhaseUsage& pu);
+
+    static WGState serializationTestObject(const ParallelWellInfo& pinfo);
+
     void wtest_state(WellTestState wtest_state);
 
     WellState well_state;
     GroupState group_state;
     WellTestState well_test_state;
 
+    bool operator==(const WGState&) const;
+
+    template<class Serializer>
+    void serializeOp(Serializer& serializer)
+    {
+        serializer(well_state);
+        serializer(group_state);
+        serializer(well_test_state);
+    }
 };
 
 }
diff --git a/tests/test_RestartSerialization.cpp b/tests/test_RestartSerialization.cpp
index 0f71013a5..a4219fbef 100644
--- a/tests/test_RestartSerialization.cpp
+++ b/tests/test_RestartSerialization.cpp
@@ -146,6 +146,22 @@ BOOST_AUTO_TEST_CASE(WellState)
     BOOST_CHECK_MESSAGE(data_out == data_in, "Deserialized WellState differ");
 }
 
+BOOST_AUTO_TEST_CASE(WGState)
+{
+    Opm::ParallelWellInfo dummy;
+    auto data_out = Opm::WGState::serializationTestObject(dummy);
+    Opm::Serialization::MemPacker packer;
+    Opm::Serializer ser(packer);
+    ser.pack(data_out);
+    const size_t pos1 = ser.position();
+    decltype(data_out) data_in(Opm::PhaseUsage{});
+    data_in.well_state = Opm::WellState(dummy);
+    ser.unpack(data_in);
+    const size_t pos2 = ser.position();
+    BOOST_CHECK_MESSAGE(pos1 == pos2, "Packed size differ from unpack size for WGState");
+    BOOST_CHECK_MESSAGE(data_out == data_in, "Deserialized WGState differ");
+}
+
 BOOST_AUTO_TEST_CASE(EclGenericVanguard)
 {
     auto in_params = Opm::EclGenericVanguard::serializationTestParams();