diff --git a/src/http/header/x_content_type_options.rs b/src/http/header/x_content_type_options.rs
index e056253cc..46638166e 100644
--- a/src/http/header/x_content_type_options.rs
+++ b/src/http/header/x_content_type_options.rs
@@ -1,6 +1,8 @@
 //! Define the X-Content-Type-Options header.
 
 use std::fmt;
+// TODO: Remove when this import isn't required in stable anymore.
+#[allow(unused_imports)]
 use std::ascii::AsciiExt;
 
 use hyper;
diff --git a/src/http/header/x_frame_options.rs b/src/http/header/x_frame_options.rs
index ff603bc99..092fd14f2 100644
--- a/src/http/header/x_frame_options.rs
+++ b/src/http/header/x_frame_options.rs
@@ -2,6 +2,8 @@
 
 use std::fmt;
 use std::str::FromStr;
+// TODO: Remove when this import isn't required in stable anymore.
+#[allow(unused_imports)]
 use std::ascii::AsciiExt;
 
 use hyper;