diff --git a/src/include/units/bits/external/type_traits.h b/src/include/units/bits/external/type_traits.h
index f48bd2ce..91a3fab2 100644
--- a/src/include/units/bits/external/type_traits.h
+++ b/src/include/units/bits/external/type_traits.h
@@ -24,6 +24,7 @@
 
 #include <units/bits/external/hacks.h>
 #include <type_traits>
+#include <utility>
 
 namespace units {