diff --git a/src/core/include/mp-units/framework/quantity_spec.h b/src/core/include/mp-units/framework/quantity_spec.h
index 7672ba029..ef21e47ec 100644
--- a/src/core/include/mp-units/framework/quantity_spec.h
+++ b/src/core/include/mp-units/framework/quantity_spec.h
@@ -684,7 +684,7 @@ struct ingredients_less :
     std::bool_constant<(lhs_compl > rhs_compl) ||
                        (lhs_compl == rhs_compl && ingredients_dimension_less(Lhs::dimension, Rhs::dimension)) ||
                        (lhs_compl == rhs_compl && Lhs::dimension == Rhs::dimension &&
-                        detail::type_name<Lhs>() < detail::type_name<Rhs>())>{};
+                        detail::type_name<Lhs>() < detail::type_name<Rhs>())> {};
 
 template<typename T1, typename T2>
 using type_list_of_ingredients_less = expr_less<T1, T2, ingredients_less>;