diff --git a/src/core/include/mp-units/framework/quantity_spec_concepts.h b/src/core/include/mp-units/framework/quantity_spec_concepts.h
index 17aaeb87..f782797b 100644
--- a/src/core/include/mp-units/framework/quantity_spec_concepts.h
+++ b/src/core/include/mp-units/framework/quantity_spec_concepts.h
@@ -151,9 +151,8 @@ concept QuantitySpecExplicitlyConvertibleTo =
   explicitly_convertible(From, To);
 
 template<auto From, auto To>
-concept QuantitySpecCastableTo =
-  QuantitySpec<MP_UNITS_REMOVE_CONST(decltype(From))> && QuantitySpec<MP_UNITS_REMOVE_CONST(decltype(To))> &&
-  castable(From, To);
+concept QuantitySpecCastableTo = QuantitySpec<MP_UNITS_REMOVE_CONST(decltype(From))> &&
+                                 QuantitySpec<MP_UNITS_REMOVE_CONST(decltype(To))> && castable(From, To);
 
 }  // namespace detail