diff --git a/include/ddc/parallel_for_each.hpp b/include/ddc/parallel_for_each.hpp
index 7b58843ac..54a725501 100644
--- a/include/ddc/parallel_for_each.hpp
+++ b/include/ddc/parallel_for_each.hpp
@@ -167,7 +167,7 @@ void parallel_for_each(
  * @param[in] f      a functor taking an index as parameter
  */
 template <class ExecSpace, class... DDims, class Functor>
-void parallel_for_each(
+std::enable_if_t<Kokkos::is_execution_space_v<ExecSpace>> parallel_for_each(
         ExecSpace const& execution_space,
         DiscreteDomain<DDims...> const& domain,
         Functor&& f) noexcept
diff --git a/include/ddc/parallel_transform_reduce.hpp b/include/ddc/parallel_transform_reduce.hpp
index 54d87656d..2cc4ea6b3 100644
--- a/include/ddc/parallel_transform_reduce.hpp
+++ b/include/ddc/parallel_transform_reduce.hpp
@@ -329,7 +329,7 @@ T parallel_transform_reduce(
  *            range. The return type must be acceptable as input to reduce
  */
 template <class ExecSpace, class... DDims, class T, class BinaryReductionOp, class UnaryTransformOp>
-T parallel_transform_reduce(
+std::enable_if_t<Kokkos::is_execution_space_v<ExecSpace>, T> parallel_transform_reduce(
         ExecSpace const& execution_space,
         DiscreteDomain<DDims...> const& domain,
         T neutral,