diff --git a/docs/api_reference/src/quantities.tex b/docs/api_reference/src/quantities.tex
index 399ed7dac..6cc10a8ad 100644
--- a/docs/api_reference/src/quantities.tex
+++ b/docs/api_reference/src/quantities.tex
@@ -825,9 +825,9 @@
 to represent the dimension of a derived quantity\irefiev{112-01-10}.
 \begin{example}
 \begin{codeblock}
-using acceleration = decltype(si::dim_speed / si::dim_time);
-static_assert(dealias(^acceleration) ==
-              ^derived_dimension<si::dim_length, per<power<si::dim_time, 2>>>);
+constexpr auto acceleration = isq::dim_speed / isq::dim_time;
+static_assert(dealias(^decltype(acceleration)) ==
+              ^derived_dimension<isq::dim_length, per<power<isq::dim_time, 2>>>);
 \end{codeblock}
 \end{example}