diff --git a/dune/solvers/norms/sumnorm.hh b/dune/solvers/norms/sumnorm.hh
index d49efc4fb3f3dc5e30d3da779d58fbc046a63e36..b00241dbf1755665b062f264c35936c2de3d9212 100644
--- a/dune/solvers/norms/sumnorm.hh
+++ b/dune/solvers/norms/sumnorm.hh
@@ -24,7 +24,7 @@ class SumNorm: public Norm<V>
         //! Compute the norm of the given vector
         field_type operator()(const VectorType &f) const
         {
-            return std::sqrt(this->SumNorm<OperatorType,VectorType>::normSquared(f));
+            return std::sqrt(normSquared(f));
         }
 
         //! Compute the square of the norm of the given vector