diff --git a/examples/simple.rs b/examples/simple.rs
index a1f7de4..bdb9821 100644
--- a/examples/simple.rs
+++ b/examples/simple.rs
@@ -1,5 +1,8 @@
 #![deny(warnings)]
+#![allow(unused_doc_comment)] // remove when error_chain is fixed
+
 //! `cargo run --example simple`
+
 extern crate reqwest;
 extern crate env_logger;
 #[macro_use]
diff --git a/src/request.rs b/src/request.rs
index a0353f1..878ee8a 100644
--- a/src/request.rs
+++ b/src/request.rs
@@ -233,7 +233,7 @@ impl RequestBuilder {
 
         {
             // check request_mut() before running serde
-            let mut req = self.request_mut();
+            let req = self.request_mut();
             let body = try_!(serde_urlencoded::to_string(form));
             req.headers_mut().set(ContentType::form_url_encoded());
             *req.body_mut() = Some(body.into());
@@ -269,7 +269,7 @@ impl RequestBuilder {
     pub fn json<T: Serialize>(&mut self, json: &T) -> ::Result<&mut RequestBuilder> {
         {
             // check request_mut() before running serde
-            let mut req = self.request_mut();
+            let req = self.request_mut();
             let body = try_!(serde_json::to_vec(json));
             req.headers_mut().set(ContentType::json());
             *req.body_mut() = Some(body.into());