diff --git a/opm/models/blackoil/blackoilintensivequantitiessimple.hh b/opm/models/blackoil/blackoilintensivequantitiessimple.hh
index f4c853be1..08eafb9f6 100644
--- a/opm/models/blackoil/blackoilintensivequantitiessimple.hh
+++ b/opm/models/blackoil/blackoilintensivequantitiessimple.hh
@@ -132,7 +132,8 @@ public:
 
     void update(const Problem& problem,const PrimaryVariables& primaryVars,unsigned globalSpaceIdx, unsigned timeIdx)
     {
-        //ParentType::update(elemCtx, dofIdx, timeIdx);//only used for extrusion factor         
+        ParentType::update(problem, primaryVars, globalSpaceIdx, timeIdx);
+
         const auto& materialParams = problem.materialLawParams(globalSpaceIdx);
         //const auto& materialParams = problem.materialLawParams(0);//NB improve speed
          Scalar RvMax;
@@ -170,6 +171,7 @@ public:
                        RvMax
              );
          rockCompTransMultiplier_ = problem.template rockCompTransMultiplier<Evaluation>(*this, globalSpaceIdx);
+         porosity_ *= problem.template rockCompPoroMultiplier<Evaluation>(*this, globalSpaceIdx);
     }
     void update_simple(//const unsigned timeIdx,
                        const unsigned timeIdx,
diff --git a/opm/models/discretization/common/fvbaseintensivequantities.hh b/opm/models/discretization/common/fvbaseintensivequantities.hh
index d8f432376..4f49b320a 100644
--- a/opm/models/discretization/common/fvbaseintensivequantities.hh
+++ b/opm/models/discretization/common/fvbaseintensivequantities.hh
@@ -46,6 +46,8 @@ class FvBaseIntensiveQuantities
     using Implementation = GetPropType<TypeTag, Properties::IntensiveQuantities>;
     using Scalar = GetPropType<TypeTag, Properties::Scalar>;
     using ElementContext = GetPropType<TypeTag, Properties::ElementContext>;
+    using Problem = GetPropType<TypeTag, Properties::Problem>;
+    using PrimaryVariables = GetPropType<TypeTag, Properties::PrimaryVariables>;
 
 public:
     // default constructor
@@ -69,6 +71,15 @@ public:
                 unsigned timeIdx)
     { extrusionFactor_ = elemCtx.problem().extrusionFactor(elemCtx, dofIdx, timeIdx); }
 
+    /*!
+     * \brief Update all quantities for a given control volume.
+     */
+    void update(const Problem& problem,
+                const PrimaryVariables& /* primaryVars */,
+                unsigned /* globalSpaceIdx */,
+                unsigned /* timeIdx */)
+    { extrusionFactor_ = problem.extrusionFactor(); }
+
     /*!
      * \brief Return how much a given sub-control volume is extruded.
      *