diff --git a/dumux/decoupled/2p2c/fvtransport2p2cadaptive.hh b/dumux/decoupled/2p2c/fvtransport2p2cadaptive.hh
index 56baba7727153ea1d63a1e79fdea03047a0ed37e..fa9dcd3dc68367376a422d1b99ce7112a5694743 100644
--- a/dumux/decoupled/2p2c/fvtransport2p2cadaptive.hh
+++ b/dumux/decoupled/2p2c/fvtransport2p2cadaptive.hh
@@ -105,7 +105,7 @@ class FVTransport2P2CAdaptive : public FVTransport2P2C<TypeTag>
     {return problem_;};
 
 public:
-    virtual void update(const Scalar t, Scalar& dt, TransportSolutionType& updateVec, bool impes);
+    virtual void update(const Scalar t, Scalar& dt, TransportSolutionType& updateVec, bool impes = false);
 
     void getMpfaFlux(Dune::FieldVector<Scalar, 2>&, Dune::FieldVector<Scalar, 2>&,
             const IntersectionIterator&, CellData&);
@@ -153,7 +153,7 @@ protected:
  *  \param impet Flag that determines if it is a real impet step or an update estimate for volume derivatives
  */
 template<class TypeTag>
-void FVTransport2P2CAdaptive<TypeTag>::update(const Scalar t, Scalar& dt, TransportSolutionType& updateVec, bool impet = false)
+void FVTransport2P2CAdaptive<TypeTag>::update(const Scalar t, Scalar& dt, TransportSolutionType& updateVec, bool impet)
 {
     this->impet_ = impet;
     // initialize dt very large
diff --git a/dumux/material/components/co2.hh b/dumux/material/components/co2.hh
index 05ccf42fdae68c8afb2f1cddef332af0307d5f1b..5123a379d9df751ff3a5558e268f94d11adc142e 100644
--- a/dumux/material/components/co2.hh
+++ b/dumux/material/components/co2.hh
@@ -48,7 +48,7 @@ namespace Dumux
 template <class Scalar, class CO2Tables>
 class CO2 : public Component<Scalar, CO2<Scalar, CO2Tables> >
 {
-    static constexpr Scalar R = Constants<Scalar>::R;
+    static const Scalar R;
     typedef typename Dumux::IdealGas<Scalar> IdealGas;
     
     static bool warningThrown;
@@ -227,7 +227,7 @@ public:
             warningThrown=true;
         }
         return CO2Tables::tabulatedDensity.at(temperature, pressure);
-	}
+    }
     /*!
      * \brief The pressure of steam in \f$\mathrm{[Pa]}\f$ at a given density and temperature.
      *
@@ -325,6 +325,9 @@ public:
     };
 };
 
+template <class Scalar, class CO2Tables>
+const Scalar CO2<Scalar, CO2Tables>::R = Constants<Scalar>::R;
+
 template <class Scalar, class CO2Tables>
 bool CO2<Scalar, CO2Tables>::warningThrown = false;