diff --git a/examples/ping-pong/src/server.rs b/examples/ping-pong/src/server.rs
index 8ff229068c..d1e46bc4db 100644
--- a/examples/ping-pong/src/server.rs
+++ b/examples/ping-pong/src/server.rs
@@ -39,10 +39,10 @@ fn handle_connection(mut stream: TcpStream) -> Result<(), Error> {
 
     // right now, the decoder buffer can only read a frame header
     // because decoder.missing_b is initialized with a header size
-    let mut decoder_buf = decoder.writable();
+    let decoder_buf = decoder.writable();
 
     // read frame header into decoder_buf
-    stream.read_exact(&mut decoder_buf)?;
+    stream.read_exact(decoder_buf)?;
 
     // this returns an error (MissingBytes), because it only read the header, and there's no payload in memory yet
     // therefore, we safely ignore the error