diff --git a/dune/gfe/rodassembler.hh b/dune/gfe/rodassembler.hh
index d65a986abc5991d14858e292dc5c62a6d726e92d..d900fcc740d8873cd0e9db1e18bd307dca5761c6 100644
--- a/dune/gfe/rodassembler.hh
+++ b/dune/gfe/rodassembler.hh
@@ -115,7 +115,7 @@ public:
 
     //! ???
     RodAssembler(const GridView &gridView)
-        : GeodesicFEAssembler<Basis, RigidBodyMotion<double,2> >(gridView,NULL)
+        : GeodesicFEAssembler<Basis, RigidBodyMotion<double,2> >(gridView,nullptr)
     {
         B = 1;
         A1 = 1;