diff --git a/libtransmission/tr-utp.c b/libtransmission/tr-utp.c
index 1c76b3fd4..8d9b6c3cf 100644
--- a/libtransmission/tr-utp.c
+++ b/libtransmission/tr-utp.c
@@ -120,7 +120,7 @@ tr_utpPacket(const unsigned char *buf, size_t buflen,
 }
 
 void
-tr_utpClose( tr_session * session )
+tr_utpClose( tr_session * session UNUSED )
 {
     if( utp_timer )
     {