diff --git a/src/systems/si/include/units/isq/si/angular_velocity.h b/src/systems/si/include/units/isq/si/angular_velocity.h
index fbb6e5c6..0cbcf686 100644
--- a/src/systems/si/include/units/isq/si/angular_velocity.h
+++ b/src/systems/si/include/units/isq/si/angular_velocity.h
@@ -29,12 +29,13 @@
 // IWYU pragma: end_exports
 
 #include <units/generic/angle.h>
+#include <units/isq/si/prefixes.h>
 #include <units/isq/si/time.h>
 #include <units/unit.h>
 
 namespace units::isq::si {
 
-struct radian_per_second : named_unit<radian_per_second, basic_symbol_text{"ω", "w"}, no_prefix> {};
+struct radian_per_second : named_unit<radian_per_second, basic_symbol_text{"ω", "w"}, prefix> {};
 
 struct dim_angular_velocity :
     isq::dim_angular_velocity<dim_angular_velocity, radian_per_second, dim_angle<>, dim_time> {};
diff --git a/src/systems/si/include/units/isq/si/length.h b/src/systems/si/include/units/isq/si/length.h
index eee2c9d2..36022dbd 100644
--- a/src/systems/si/include/units/isq/si/length.h
+++ b/src/systems/si/include/units/isq/si/length.h
@@ -56,7 +56,7 @@ struct exametre : prefixed_unit<exametre, exa, metre> {};
 struct zettametre : prefixed_unit<zettametre, zetta, metre> {};
 struct yottametre : prefixed_unit<yottametre, yotta, metre> {};
 
-struct astronomical_unit : named_scaled_unit<astronomical_unit, "au", no_prefix, ratio(149'597'870'700), metre> {};
+struct astronomical_unit : named_scaled_unit<astronomical_unit, "au", prefix, ratio(149'597'870'700), metre> {};
 
 struct dim_length : isq::dim_length<metre> {};
 
diff --git a/src/systems/si/include/units/isq/si/mass.h b/src/systems/si/include/units/isq/si/mass.h
index 620381b3..89776694 100644
--- a/src/systems/si/include/units/isq/si/mass.h
+++ b/src/systems/si/include/units/isq/si/mass.h
@@ -79,7 +79,7 @@ struct zettatonne : prefixed_unit<zettatonne, zetta, tonne> {};
 struct yottatonne : prefixed_unit<yottatonne, yotta, tonne> {};
 
 struct dalton :
-    named_scaled_unit<dalton, "Da", no_prefix, ratio(16'605'390'666'050, 10'000'000'000'000, -27), kilogram> {};
+    named_scaled_unit<dalton, "Da", prefix, ratio(16'605'390'666'050, 10'000'000'000'000, -27), kilogram> {};
 
 struct dim_mass : isq::dim_mass<kilogram> {};