diff --git a/src/systems/si/include/mp_units/systems/si/constants.h b/src/systems/si/include/mp_units/systems/si/constants.h
index 33e19df1..2695d86a 100644
--- a/src/systems/si/include/mp_units/systems/si/constants.h
+++ b/src/systems/si/include/mp_units/systems/si/constants.h
@@ -66,7 +66,7 @@ inline constexpr struct magnetic_constant_unit :
   constant_unit<basic_symbol_text{"μ₀", "u0"}, mag<4> * mag_pi * mag_power<10, -7> * henry / metre> {} magnetic_constant_unit;
 // clang-format on
 
-inline constexpr auto standard_gravity = isq::acceleration[standard_gravity_unit];
+inline constexpr auto standard_gravity = isq::acceleration_of_free_fall[standard_gravity_unit];
 inline constexpr auto magnetic_constant = isq::magnetic_constant[magnetic_constant_unit];
 
 }  // namespace mp_units::si