diff --git a/src/net/nl_wifi_w600.c b/src/net/nl_wifi_w600.c
index cc8d6e6..03fb0f2 100644
--- a/src/net/nl_wifi_w600.c
+++ b/src/net/nl_wifi_w600.c
@@ -304,7 +304,9 @@ void nl_wifi_status(nl_wifi_status_t *out)
         ip4addr_ntoa_r(ip_2_ip4(&e->ip_addr), out->sta_ip, sizeof out->sta_ip);
         memset(&bss, 0, sizeof bss);
         tls_wifi_get_current_bss(&bss);
-        out->rssi = (int)(int8_t)bss.rssi;
+        /* W600 SDK reports RSSI magnitude as unsigned; EVK ninIOT measured ~-50 dBm as 50.
+         * Report negative for 0 < bss.rssi <= 127, unchanged for > 127 (already two's complement). */
+        out->rssi = (bss.rssi > 0 && bss.rssi <= 127) ? -(int)bss.rssi : (int)(int8_t)bss.rssi;
     }
     if (out->sta_ip[0])
         copy(out->ip, out->sta_ip, sizeof out->ip);