diff --git a/src/structures/ring_buffer.rs b/src/structures/ring_buffer.rs
index 8a9b6fb..f5681f6 100644
--- a/src/structures/ring_buffer.rs
+++ b/src/structures/ring_buffer.rs
@@ -110,7 +110,10 @@ where
     }
 
     fn write_bytes(&self, transmit_data: &mut RingBuffer<N>) {
-        <Self as SoftSerialWriter<P, &mut RingBuffer<N>>>::write_byte(self, N as u8);
+        <Self as SoftSerialWriter<P, &mut RingBuffer<N>>>::write_byte(
+            self,
+            transmit_data.len() as u8,
+        );
 
         for _ in 0..N {
             let byte = transmit_data.pop().unwrap_or(0);