diff --git a/src/systems/isq/include/units/isq/base_quantities.h b/src/systems/isq/include/units/isq/base_quantities.h
index 420182f0..fc256b84 100644
--- a/src/systems/isq/include/units/isq/base_quantities.h
+++ b/src/systems/isq/include/units/isq/base_quantities.h
@@ -23,8 +23,8 @@
 #pragma once
 
 #include <units/dimension.h>
+#include <units/quantity.h>
 #include <units/quantity_spec.h>
-#include <units/reference.h>
 
 namespace units::isq {