diff --git a/src/core/include/mp-units/framework/reference.h b/src/core/include/mp-units/framework/reference.h
index 4d46a26d..d5b980d7 100644
--- a/src/core/include/mp-units/framework/reference.h
+++ b/src/core/include/mp-units/framework/reference.h
@@ -26,6 +26,7 @@
 #include <mp-units/bits/get_associated_quantity.h>
 #include <mp-units/bits/module_macros.h>
 #include <mp-units/framework/quantity_concepts.h>
+#include <mp-units/framework/quantity_point_concepts.h>
 #include <mp-units/framework/reference_concepts.h>
 #include <mp-units/framework/representation_concepts.h>