diff --git a/dune/istl/paamg/amg.hh b/dune/istl/paamg/amg.hh
index a224b2b8149ec3ee657be6f821857b2c9dae04c6..7c2e57370f15d22d2d44f9c69af9b12c6bfb9d9f 100644
--- a/dune/istl/paamg/amg.hh
+++ b/dune/istl/paamg/amg.hh
@@ -874,7 +874,7 @@ namespace Dune
 
       for(typename Hierarchy<Domain,A>::Iterator coarseLhs = lhs--; coarseLhs != lhs_->finest(); coarseLhs = lhs--, --aggregates, --pinfo) {
         Transfer<typename OperatorHierarchy::AggregatesMap::AggregateDescriptor,Range,ParallelInformation>
-        ::prolongateVector(*(*aggregates), *coarseLhs, *lhs, 1, *pinfo);
+        ::prolongateVector(*(*aggregates), *coarseLhs, *lhs, 1.0, *pinfo);
       }
     }