diff --git a/dune/solvers/operators/nulloperator.hh b/dune/solvers/operators/nulloperator.hh
index f9b2888b151638efed9083619ff67f6c5b989a51..869b893f67ef87f777cdbbde3ef6cd3559c30b53 100644
--- a/dune/solvers/operators/nulloperator.hh
+++ b/dune/solvers/operators/nulloperator.hh
@@ -32,6 +32,10 @@ class NullOperator
     public:
         //! export the block type
         typedef BlockType block_type;
+        //! export the field type
+        typedef typename block_type::field_type field_type;
+        //! export the size type
+        typedef size_t size_type;
 
         //! Default constructor
         NullOperator(){}