diff --git a/dune/solvers/operators/nulloperator.hh b/dune/solvers/operators/nulloperator.hh
index 869b893f67ef87f777cdbbde3ef6cd3559c30b53..cff406947d5301b4ef7354c51981f3a28c9d679a 100644
--- a/dune/solvers/operators/nulloperator.hh
+++ b/dune/solvers/operators/nulloperator.hh
@@ -85,6 +85,10 @@ class NullOperator
             return rowDummy_[0];
         }
 
+        //! multiplication operator with scalar
+        void operator*=(const field_type&)
+        {}
+
 };
 
 #endif