diff --git a/folly/hash/Hash.h b/folly/hash/Hash.h
index 33fa553..4266cf1 100644
--- a/folly/hash/Hash.h
+++ b/folly/hash/Hash.h
@@ -730,7 +730,7 @@ struct TupleHasher<0, Ts...> {
 
 // Custom hash functions.
 namespace std {
-#if FOLLY_SUPPLY_MISSING_INT128_TRAITS
+#if 0
 template <>
 struct hash<__int128> : folly::detail::integral_hasher<__int128> {};
 
