diff --git a/src/utility/include/mp-units/math.h b/src/utility/include/mp-units/math.h
index 29254672..120f0f09 100644
--- a/src/utility/include/mp-units/math.h
+++ b/src/utility/include/mp-units/math.h
@@ -281,7 +281,7 @@ template<Unit auto To, auto R, typename Rep>
     value_cast<To>(1 / q);
   }
 {
-  return (quantity_values<Rep>::one() * one).force_in(To * q.unit) / q;
+  return (quantity_values<Rep>::one() * one).force_in(To * quantity<R, Rep>::unit) / q;
 }
 
 /**