diff --git a/src/lib.rs b/src/lib.rs
index c6f4e2c..ef3df7c 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,5 +1,3 @@
-#![feature(slice_flatten)]
-
 use rand::random;
 use rand::seq::SliceRandom;
 use std::collections::HashMap;