diff --git a/src/client/request.rs b/src/client/request.rs
index ef058373b..650f0eeaa 100644
--- a/src/client/request.rs
+++ b/src/client/request.rs
@@ -429,14 +429,13 @@ impl ClientRequestBuilder {
     {
         if let Some(parts) = parts(&mut self.request, &self.err) {
             match HeaderName::try_from(key) {
-                Ok(key) => match parts.headers.contains_key(&key) {
-                    false => match value.try_into() {
+                Ok(key) => if !parts.headers.contains_key(&key) {
+                    match value.try_into() {
                         Ok(value) => {
                             parts.headers.insert(key, value);
                         }
                         Err(e) => self.err = Some(e.into()),
-                    },
-                    true => (),
+                    }
                 },
                 Err(e) => self.err = Some(e.into()),
             };
diff --git a/tests/test_ws.rs b/tests/test_ws.rs
index 96d97b824..66a9153dc 100644
--- a/tests/test_ws.rs
+++ b/tests/test_ws.rs
@@ -9,7 +9,6 @@ use bytes::Bytes;
 use futures::Stream;
 use rand::distributions::Alphanumeric;
 use rand::Rng;
-use std::time::Duration;
 
 #[cfg(feature = "alpn")]
 extern crate openssl;