diff --git a/gaugemqttcontinuous.py b/gaugemqttcontinuous.py
index c9f800e..a58b3f8 100644
--- a/gaugemqttcontinuous.py
+++ b/gaugemqttcontinuous.py
@@ -172,7 +172,7 @@ def connect_wifi(ssid, password, timeout_s=15):
 
 
 def check_wifi():
-    global _last_wifi_check, _wifi_reconnect_delay_s
+    global _wifi_sta, _last_wifi_check, _wifi_reconnect_delay_s
     now = utime.ticks_ms()
     if utime.ticks_diff(now, _last_wifi_check) < _wifi_check_interval_ms:
         return