diff --git a/src/proto/stun.rs b/src/proto/stun.rs
index ae8c749..24b209c 100644
--- a/src/proto/stun.rs
+++ b/src/proto/stun.rs
@@ -354,7 +354,7 @@ impl Into<Vec<u8>> for StunPacket {
 pub fn repl<'a>(
     data: &'a [u8],
     _masscanned: &Masscanned,
-    mut client_info: &mut ClientInfo,
+    client_info: &mut ClientInfo,
     _tcb: Option<&mut TCPControlBlock>,
 ) -> Option<Vec<u8>> {
     debug!("receiving STUN data");