diff --git a/clippy_lints/src/lib.rs b/clippy_lints/src/lib.rs
index 3de7c6de9797..76649d8a1451 100644
--- a/clippy_lints/src/lib.rs
+++ b/clippy_lints/src/lib.rs
@@ -12,7 +12,6 @@
 #![feature(iterator_find_map)]
 #![feature(macro_at_most_once_rep)]
 #![feature(tool_attributes)]
-#![feature(rust_2018_preview)]
 #![warn(rust_2018_idioms)]
 
 use toml;
diff --git a/mini-macro/src/lib.rs b/mini-macro/src/lib.rs
index 3417e603c126..478224fdfcaf 100644
--- a/mini-macro/src/lib.rs
+++ b/mini-macro/src/lib.rs
@@ -1,4 +1,4 @@
-#![feature(use_extern_macros, proc_macro_quote, proc_macro_non_items)]
+#![feature(proc_macro_quote, proc_macro_non_items)]
 extern crate proc_macro;
 
 use proc_macro::{TokenStream, quote};
@@ -8,4 +8,4 @@ pub fn mini_macro(_: TokenStream) -> TokenStream {
     quote!(
         #[allow(unused)] fn needless_take_by_value(s: String) { println!("{}", s.len()); }
     )
-}
\ No newline at end of file
+}
diff --git a/src/lib.rs b/src/lib.rs
index c2363fef9072..e6aaff1b2a95 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,6 +1,5 @@
 // error-pattern:cargo-clippy
 #![feature(plugin_registrar)]
-#![feature(rust_2018_preview)]
 #![feature(rustc_private)]
 #![feature(macro_vis_matcher)]
 #![allow(unknown_lints)]