diff --git a/triqs/arrays/indexmaps/cuboid/domain.hpp b/triqs/arrays/indexmaps/cuboid/domain.hpp
index b58f61a9..24e6f75e 100644
--- a/triqs/arrays/indexmaps/cuboid/domain.hpp
+++ b/triqs/arrays/indexmaps/cuboid/domain.hpp
@@ -56,7 +56,7 @@ namespace triqs { namespace arrays { namespace indexmaps { namespace cuboid {
    domain_t (n_uple lengths):lengths_(std::move(lengths)) {}
    domain_t (mini_vector<int,Rank> const & lengths):lengths_(lengths) {}
    domain_t (std::vector<std::size_t> const & l):lengths_() {
-    if (!(l.size()==rank)) TRIQS_RUNTIME_ERROR << "cuboid domain_t construction : vector size incorrect : got "<<l.size() <<" while expected "<< rank;
+    if (!(l.size()==Rank)) TRIQS_RUNTIME_ERROR << "cuboid domain_t construction : vector size incorrect : got "<<l.size() <<" while expected "<< Rank;
     lengths_ = n_uple(l);
    }
    template <typename ... T> domain_t(size_t i0, T... t): lengths_(i0, t...){}