diff --git a/hardware/tondaj-sl-814/protocol.c b/hardware/tondaj-sl-814/protocol.c
index 2830905c..57472520 100644
--- a/hardware/tondaj-sl-814/protocol.c
+++ b/hardware/tondaj-sl-814/protocol.c
@@ -112,6 +112,7 @@ int tondaj_sl_814_receive_data(int fd, int revents, void *cb_data)
 	uint8_t buf[3];
 	int ret;
 
+	(void)fd;
 	(void)revents;
 
 	sdi = cb_data;