diff --git a/src/core/include/mp-units/framework/quantity.h b/src/core/include/mp-units/framework/quantity.h
index 67ea73ff..3c4dc0c9 100644
--- a/src/core/include/mp-units/framework/quantity.h
+++ b/src/core/include/mp-units/framework/quantity.h
@@ -63,9 +63,11 @@ template<typename T>
 concept IsFloatingPoint = treat_as_floating_point<T>;
 
 template<typename FromRep, typename ToRep, auto FromUnit = one, auto ToUnit = one>
-concept ValuePreservingTo = requires(FromRep&& from, ToRep to) {
-  { to = std::forward<FromRep>(from) } -> std::same_as<ToRep&>;
-} && (IsFloatingPoint<ToRep> || (!IsFloatingPoint<FromRep> && (integral_conversion_factor(FromUnit, ToUnit))));
+concept ValuePreservingTo =
+  requires(FromRep&& from, ToRep to) {
+    { to = std::forward<FromRep>(from) } -> std::same_as<ToRep&>;
+  } && (IsFloatingPoint<ToRep> ||
+        (!IsFloatingPoint<std::remove_cvref_t<FromRep>> && (integral_conversion_factor(FromUnit, ToUnit))));
 
 template<typename QFrom, typename QTo>
 concept QuantityConvertibleTo =