diff --git a/src/server.c b/src/server.c
index c7c974d..270e4fb 100644
--- a/src/server.c
+++ b/src/server.c
@@ -2117,7 +2117,7 @@ static int handle_sock_raw(patty_ax25_server *server,
     while (1) {
         ssize_t len;
 
-        if ((len = patty_kiss_tnc_drain(raw, iface->tx_buf, iface->mtu)) < 0) {
+        if (patty_kiss_tnc_drain(raw, iface->tx_buf, iface->mtu) < 0) {
             goto error_io;
         }