diff --git a/libcxx/include/optional b/libcxx/include/optional
index abfd9eb9fc9819..eeb7ba73d99818 100644
--- a/libcxx/include/optional
+++ b/libcxx/include/optional
@@ -172,6 +172,8 @@ template<class T>
 #include <__type_traits/is_trivially_destructible.h>
 #include <__type_traits/is_trivially_move_assignable.h>
 #include <__type_traits/is_trivially_move_constructible.h>
+#include <__type_traits/conjunction.h>
+#include <__type_traits/disjunction.h>
 #include <__type_traits/negation.h>
 #include <__utility/declval.h>
 #include <__utility/forward.h>