diff --git a/clippy_lints/src/lib.rs b/clippy_lints/src/lib.rs
index 451374c9a4732..c343cf364f63f 100644
--- a/clippy_lints/src/lib.rs
+++ b/clippy_lints/src/lib.rs
@@ -15,7 +15,7 @@
 #![feature(slice_patterns)]
 #![feature(stmt_expr_attributes)]
 #![feature(range_contains)]
-#![allow(unknown_lints, clippy::shadow_reuse, clippy::missing_docs_in_private_items)]
+#![allow(clippy::shadow_reuse, clippy::missing_docs_in_private_items)]
 #![recursion_limit = "256"]
 #![feature(macro_at_most_once_rep)]
 
diff --git a/src/driver.rs b/src/driver.rs
index 6af0f0be19031..9abe6bd91de52 100644
--- a/src/driver.rs
+++ b/src/driver.rs
@@ -13,7 +13,7 @@
 #![feature(rustc_private)]
 
 #![feature(try_from)]
-#![allow(unknown_lints, clippy::missing_docs_in_private_items)]
+#![allow(clippy::missing_docs_in_private_items)]
 
 // FIXME: switch to something more ergonomic here, once available.
 // (currently there is no way to opt into sysroot crates w/o `extern crate`)
diff --git a/src/lib.rs b/src/lib.rs
index 62c9da03278cc..97f1f81091d74 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -12,7 +12,6 @@
 #![feature(plugin_registrar)]
 #![feature(rustc_private)]
 
-#![allow(unknown_lints)]
 #![allow(clippy::missing_docs_in_private_items)]
 #![warn(rust_2018_idioms)]
 
diff --git a/src/main.rs b/src/main.rs
index efdcc42dea30a..4a1dc487cea03 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -12,7 +12,7 @@
 #![feature(box_syntax)]
 #![feature(rustc_private)]
 
-#![allow(unknown_lints, clippy::missing_docs_in_private_items)]
+#![allow(clippy::missing_docs_in_private_items)]
 
 use rustc_tools_util::*;
 
diff --git a/tests/ui/eta.rs b/tests/ui/eta.rs
index e516dd6910a58..dd41433d2db96 100644
--- a/tests/ui/eta.rs
+++ b/tests/ui/eta.rs
@@ -10,7 +10,7 @@
 
 
 
-#![allow(unknown_lints, unused, clippy::no_effect, clippy::redundant_closure_call, clippy::many_single_char_names, clippy::needless_pass_by_value, clippy::option_map_unit_fn, clippy::trivially_copy_pass_by_ref)]
+#![allow(unused, clippy::no_effect, clippy::redundant_closure_call, clippy::many_single_char_names, clippy::needless_pass_by_value, clippy::option_map_unit_fn, clippy::trivially_copy_pass_by_ref)]
 #![warn(clippy::redundant_closure, clippy::needless_borrow)]
 
 fn main() {