diff --git a/src/core/include/units/quantity.h b/src/core/include/units/quantity.h
index 7956cd11..da3825a1 100644
--- a/src/core/include/units/quantity.h
+++ b/src/core/include/units/quantity.h
@@ -461,14 +461,7 @@ template<typename D, typename U, typename Rep>
 inline constexpr bool is_quantity<quantity<D, U, Rep>> = true;
 
 template<typename T>
-requires units::is_derived_from_specialization_of<T, units::quantity> &&
-        requires {
-    typename T::dimension;
-    typename T::unit;
-    typename T::rep;
-    requires Dimension<typename T::dimension>;
-    requires Unit<typename T::unit>;
-    requires Representation<typename T::rep>; }
+requires units::is_derived_from_specialization_of<T, units::quantity>
 inline constexpr bool is_quantity<T> = true;
 
 }  // namespace detail