diff --git a/tokio/src/macros/select.rs b/tokio/src/macros/select.rs
index 51b6fcd60..fc932bb90 100644
--- a/tokio/src/macros/select.rs
+++ b/tokio/src/macros/select.rs
@@ -359,8 +359,11 @@ macro_rules! select {
                 let start = $crate::macros::support::thread_rng_n(BRANCHES);
 
                 for i in 0..BRANCHES {
-                    let branch = (start + i) % BRANCHES;
-
+                    let branch;
+                    #[allow(clippy::modulo_one)]
+                    {
+                        branch = (start + i) % BRANCHES;
+                    }
                     match branch {
                         $(
                             $crate::count!( $($skip)* ) => {
diff --git a/tokio/tests/tcp_into_split.rs b/tokio/tests/tcp_into_split.rs
index 6561fa30a..1c2af32eb 100644
--- a/tokio/tests/tcp_into_split.rs
+++ b/tokio/tests/tcp_into_split.rs
@@ -94,7 +94,7 @@ async fn drop_write() -> Result<()> {
 
     let handle = thread::spawn(move || {
         let (mut stream, _) = listener.accept().unwrap();
-        stream.write(MSG).unwrap();
+        stream.write_all(MSG).unwrap();
 
         let mut read_buf = [0u8; 32];
         let res = match stream.read(&mut read_buf) {
diff --git a/tokio/tests/tcp_split.rs b/tokio/tests/tcp_split.rs
index 42f797708..7171dac46 100644
--- a/tokio/tests/tcp_split.rs
+++ b/tokio/tests/tcp_split.rs
@@ -17,7 +17,7 @@ async fn split() -> Result<()> {
 
     let handle = thread::spawn(move || {
         let (mut stream, _) = listener.accept().unwrap();
-        stream.write(MSG).unwrap();
+        stream.write_all(MSG).unwrap();
 
         let mut read_buf = [0u8; 32];
         let read_len = stream.read(&mut read_buf).unwrap();