diff --git a/opm/core/props/pvt/PvtConstCompr.hpp b/opm/core/props/pvt/PvtConstCompr.hpp
index 542e2093..1e76f97c 100644
--- a/opm/core/props/pvt/PvtConstCompr.hpp
+++ b/opm/core/props/pvt/PvtConstCompr.hpp
@@ -47,6 +47,8 @@ namespace Opm
     {
     public:
         PvtConstCompr()
+            : oilvisctTables_(0),
+              watvisctTables_(0)
         {}
 
         void initFromWater(Opm::DeckKeywordConstPtr pvtwKeyword)