diff --git a/src/core/include/mp-units/bits/external/hacks.h b/src/core/include/mp-units/bits/external/hacks.h
index b453aac6..44c3d452 100644
--- a/src/core/include/mp-units/bits/external/hacks.h
+++ b/src/core/include/mp-units/bits/external/hacks.h
@@ -22,6 +22,8 @@
 
 #pragma once
 
+#include <version>
+
 #if __clang__
 #define MP_UNITS_COMP_CLANG __clang_major__
 #elif __GNUC__