diff --git a/libraries/ESP8266WiFi/src/ESP8266WiFiSTA.cpp b/libraries/ESP8266WiFi/src/ESP8266WiFiSTA.cpp
index 8f52942b74..b435129770 100644
--- a/libraries/ESP8266WiFi/src/ESP8266WiFiSTA.cpp
+++ b/libraries/ESP8266WiFi/src/ESP8266WiFiSTA.cpp
@@ -196,6 +196,7 @@ wl_status_t ESP8266WiFiSTAClass::begin(const char* ssid, const char *passphrase,
 
     ETS_UART_INTR_DISABLE();
     if(connect) {
+        wifi_station_disconnect();
         wifi_station_connect();
     }
     ETS_UART_INTR_ENABLE();