diff --git a/docs/api_reference/src/quantities.tex b/docs/api_reference/src/quantities.tex
index 47c035972..22b1303e4 100644
--- a/docs/api_reference/src/quantities.tex
+++ b/docs/api_reference/src/quantities.tex
@@ -1874,7 +1874,12 @@
   {
     if constexpr (^const M == ^decltype(mag<1>))
       return u;
-    else
+    else if constexpr (@\exposidnc{is-specialization-of}@(^U, ^scaled_unit)) {
+      if constexpr (M{} * U::mag == mag<1>)
+        return U::reference_unit;
+      else
+        return scaled_unit<M{} * U::mag, std::remove_const_t<decltype(U::reference_unit)>>{};
+    } else
       return scaled_unit<M{}, U>{};
   }