diff --git a/opm/core/simulator/BlackoilState.cpp b/opm/core/simulator/BlackoilState.cpp
index 1f51dabba..c274136a9 100644
--- a/opm/core/simulator/BlackoilState.cpp
+++ b/opm/core/simulator/BlackoilState.cpp
@@ -24,12 +24,14 @@ BlackoilState::BlackoilState( const BlackoilState& other )
     : SimulationDataContainer(other)
 {
     setBlackoilStateReferencePointers();
+    hydrocarbonstate_ = other.hydroCarbonState();
 }
 
 BlackoilState& BlackoilState::operator=( const BlackoilState& other )
 {
     SimulationDataContainer::operator=(other);
     setBlackoilStateReferencePointers();
+    hydrocarbonstate_ = other.hydroCarbonState();
     return *this;
 }
 
diff --git a/opm/core/simulator/BlackoilState.hpp b/opm/core/simulator/BlackoilState.hpp
index 7f45e029f..51c6c21cb 100644
--- a/opm/core/simulator/BlackoilState.hpp
+++ b/opm/core/simulator/BlackoilState.hpp
@@ -62,10 +62,12 @@ namespace Opm
         std::vector<double>& surfacevol  () { return *surfacevol_ref_;  }
         std::vector<double>& gasoilratio () { return *gasoilratio_ref_; }
         std::vector<double>& rv ()          { return *rv_ref_;          }
+        std::vector<int>& hydroCarbonState() { return hydrocarbonstate_;  }
 
         const std::vector<double>& surfacevol  () const { return *surfacevol_ref_;  }
         const std::vector<double>& gasoilratio () const { return *gasoilratio_ref_; }
         const std::vector<double>& rv ()          const { return *rv_ref_;          }
+        const std::vector<int>& hydroCarbonState() const { return hydrocarbonstate_;  }
 
     private:
         void setBlackoilStateReferencePointers();
@@ -73,6 +75,9 @@ namespace Opm
         std::vector<double>* gasoilratio_ref_;
         std::vector<double>* rv_ref_;
 
+        // A vector storing the hydro carbon state.
+        std::vector<int> hydrocarbonstate_;
+
 
     };
 } // namespace Opm