diff --git a/src/lib/lib.rs b/src/lib/lib.rs
index 22a8e9b..437a2fc 100644
--- a/src/lib/lib.rs
+++ b/src/lib/lib.rs
@@ -1,3 +1,4 @@
+#![feature(arbitrary_enum_discriminant)]
 #![feature(generator_trait)]
 #![feature(generators)]
 #![feature(if_let_guard)]