diff --git a/src/liblog/lib.rs b/src/liblog/lib.rs
index ca61e3d1655a..47cfb73fb718 100644
--- a/src/liblog/lib.rs
+++ b/src/liblog/lib.rs
@@ -163,6 +163,8 @@
        html_favicon_url = "http://www.rust-lang.org/favicon.ico",
        html_root_url = "http://doc.rust-lang.org/nightly/",
        html_playground_url = "http://play.rust-lang.org/")]
+
+#![allow(unknown_features)]
 #![feature(slicing_syntax)]
 #![feature(box_syntax)]
 #![deny(missing_docs)]