diff --git a/src/message.rs b/src/message.rs
index 3e71ec5..f9750bc 100644
--- a/src/message.rs
+++ b/src/message.rs
@@ -110,7 +110,7 @@ pub trait MessageType<const L: usize> {
 pub struct Can20<const L: usize> {}
 
 impl<const L: usize> MessageType<L> for Can20<L> {
-    fn setup_header(&self, header: &mut TxHeader, payload_length: usize) -> Result<(), MessageError> {
+    fn setup_header(&self, _header: &mut TxHeader, payload_length: usize) -> Result<(), MessageError> {
         if L > 8 || payload_length > 8 {
             let max = payload_length.max(L);
             debug!("Maximum of 64 bytes allowed. Current size: {max} bytes");