diff --git a/src/core/include/mp-units/bits/core_gmf.h b/src/core/include/mp-units/bits/core_gmf.h
index 8c21e6ec8..65210a7c1 100644
--- a/src/core/include/mp-units/bits/core_gmf.h
+++ b/src/core/include/mp-units/bits/core_gmf.h
@@ -25,6 +25,7 @@
 // core
 #include <gsl/gsl-lite.hpp>
 #include <mp-units/bits/external/hacks.h>
+#include <mp-units/compat_macros.h>
 #include <array>
 #include <cmath>
 #include <compare>