diff --git a/src/replay/recorder.rs b/src/replay/recorder.rs
index 3654ce0..b5c77cb 100644
--- a/src/replay/recorder.rs
+++ b/src/replay/recorder.rs
@@ -68,11 +68,12 @@ impl Recorder {
     }
 
     pub fn save_raw_packet(&mut self, raw_packet: &[u8]) -> Result<()> {
-        let mut data = Vec::with_capacity(raw_packet.len() + 8);
-        data.extend(TryInto::<u32>::try_into(self.start.elapsed().as_millis())?.to_be_bytes());
-        data.extend(TryInto::<u32>::try_into(raw_packet.len())?.to_be_bytes());
-        data.extend(raw_packet);
-        self.zip_writer.write_all(&data)?;
+        self.zip_writer.write_all(
+            &TryInto::<u32>::try_into(self.start.elapsed().as_millis())?.to_be_bytes(),
+        )?;
+        self.zip_writer
+            .write_all(&TryInto::<u32>::try_into(raw_packet.len())?.to_be_bytes())?;
+        self.zip_writer.write_all(raw_packet)?;
         Ok(())
     }