diff --git a/src/lib.rs b/src/lib.rs
index 100f09ef..cc62b0ab 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,4 +1,3 @@
-#![feature(str_split_as_str)]
 //! # mdBook
 //!
 //! **mdBook** is a tool for rendering a collection of markdown documents into