diff --git a/dune/istl/paamg/aggregates.hh b/dune/istl/paamg/aggregates.hh
index 77449dc81c5982e12ed04756407a94ee35ec5640..352e6272476f1092305df96dba61ac6f4c9d2b27 100644
--- a/dune/istl/paamg/aggregates.hh
+++ b/dune/istl/paamg/aggregates.hh
@@ -15,6 +15,7 @@
 #include <dune/common/poolallocator.hh>
 #include <dune/common/sllist.hh>
 #include <dune/common/unused.hh>
+#include <dune/common/ftraits.hh>
 
 #include <utility>
 #include <set>