diff --git a/actix-http/src/test.rs b/actix-http/src/test.rs
index 4f6b88c09..8f0a7d21a 100644
--- a/actix-http/src/test.rs
+++ b/actix-http/src/test.rs
@@ -105,12 +105,13 @@ impl TestRequest {
         match header.try_into_header_pair() {
             Ok((key, value)) => {
                 parts(&mut self.0).headers.insert(key, value);
-                return self;
             }
             Err(err) => {
                 panic!("Error inserting test header: {}.", err.into());
             }
         }
+
+        self
     }
 
     /// Append a header, keeping any that were set with an equivalent field name.
@@ -121,12 +122,13 @@ impl TestRequest {
         match header.try_into_header_pair() {
             Ok((key, value)) => {
                 parts(&mut self.0).headers.append(key, value);
-                return self;
             }
             Err(err) => {
                 panic!("Error inserting test header: {}.", err.into());
             }
         }
+
+        self
     }
 
     /// Set cookie for this request.
diff --git a/actix-http/tests/test_rustls.rs b/actix-http/tests/test_rustls.rs
index beae359d9..2f6b31f49 100644
--- a/actix-http/tests/test_rustls.rs
+++ b/actix-http/tests/test_rustls.rs
@@ -181,7 +181,7 @@ async fn test_h2_headers() {
         HttpService::build().h2(move |_| {
             let mut config = Response::Ok();
             for idx in 0..90 {
-                config.header(
+                config.insert_header((
                     format!("X-TEST-{}", idx).as_str(),
                     "TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST \
                         TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST \
@@ -196,7 +196,7 @@ async fn test_h2_headers() {
                         TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST \
                         TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST \
                         TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST TEST ",
-                );
+                ));
             }
             future::ok::<_, ()>(config.body(data.clone()))
         })
@@ -352,7 +352,7 @@ async fn test_h2_body_chunked_explicit() {
                 let body = once(ok::<_, Error>(Bytes::from_static(STR.as_ref())));
                 ok::<_, ()>(
                     Response::Ok()
-                        .header(header::TRANSFER_ENCODING, "chunked")
+                        .insert_header((header::TRANSFER_ENCODING, "chunked"))
                         .streaming(body),
                 )
             })
@@ -380,7 +380,7 @@ async fn test_h2_response_http_error_handling() {
                     let broken_header = Bytes::from_static(b"\0\0\0");
                     ok::<_, ()>(
                         Response::Ok()
-                            .header(http::header::CONTENT_TYPE, broken_header)
+                            .insert_header((http::header::CONTENT_TYPE, broken_header))
                             .body(STR),
                     )
                 }))