diff --git a/sys/dev/usb/wlan/if_urtwn.c b/sys/dev/usb/wlan/if_urtwn.c
index 925717505b69..7f69f9617e3e 100644
--- a/sys/dev/usb/wlan/if_urtwn.c
+++ b/sys/dev/usb/wlan/if_urtwn.c
@@ -1738,6 +1738,7 @@ urtwn_r88e_get_rssi(struct urtwn_softc *sc, int rate, void *physt)
 	uint8_t cck_agc_rpt, lna_idx, vga_idx;
 	int8_t rssi;
 
+	rssi = 0;
 	if (rate <= 3) {
 		cck = (struct r88e_rx_cck *)physt;
 		cck_agc_rpt = cck->agc_rpt;