diff --git a/opm/material/fluidsystems/blackoilpvt/LiveOilPvt.hpp b/opm/material/fluidsystems/blackoilpvt/LiveOilPvt.hpp
index e928a0f44..46409efca 100644
--- a/opm/material/fluidsystems/blackoilpvt/LiveOilPvt.hpp
+++ b/opm/material/fluidsystems/blackoilpvt/LiveOilPvt.hpp
@@ -55,6 +55,11 @@ class LiveOilPvt
     typedef std::vector<std::pair<Scalar, Scalar> > SamplingPoints;
 
 public:
+    LiveOilPvt()
+    {
+        vapPar2_ = 0.0;
+    }
+
 #if HAVE_OPM_PARSER
     /*!
      * \brief Initialize the oil parameters via the data specified by the PVTO ECL keyword.
diff --git a/opm/material/fluidsystems/blackoilpvt/WetGasPvt.hpp b/opm/material/fluidsystems/blackoilpvt/WetGasPvt.hpp
index 3f91b8155..2552e3ded 100644
--- a/opm/material/fluidsystems/blackoilpvt/WetGasPvt.hpp
+++ b/opm/material/fluidsystems/blackoilpvt/WetGasPvt.hpp
@@ -55,6 +55,11 @@ class WetGasPvt
     typedef std::vector<std::pair<Scalar, Scalar> > SamplingPoints;
 
 public:
+    WetGasPvt()
+    {
+        vapPar1_ = 0.0;
+    }
+
 #if HAVE_OPM_PARSER
     /*!
      * \brief Initialize the parameters for wet gas using an ECL deck.