diff --git a/dune/istl/paamg/aggregates.hh b/dune/istl/paamg/aggregates.hh
index 02554dd7de806c9f8c2943e9576150a429ee9ab0..6b657d045cb52d701afb569a801611d32b4c779d 100644
--- a/dune/istl/paamg/aggregates.hh
+++ b/dune/istl/paamg/aggregates.hh
@@ -351,6 +351,8 @@ namespace Dune
       /** @brief The matrix we work on. */
       const Matrix* matrix_;
       /** @brief The current max value.*/
+      typedef typename Matrix::field_type field_type;
+      typedef typename FieldTraits<field_type>::real_type real_type;
       real_type maxValue_;
       /** @brief The functor for calculating the norm. */
       Norm norm_;