diff --git a/sonoff/sonoff.ino b/sonoff/sonoff.ino
index 23ee2a27d..d9453e3c4 100755
--- a/sonoff/sonoff.ino
+++ b/sonoff/sonoff.ino
@@ -2037,7 +2037,12 @@ void Every250mSeconds()
 #endif  // BE_MINIMAL
           snprintf_P(log_data, sizeof(log_data), PSTR(D_LOG_UPLOAD "%s"), mqtt_data);
           AddLog(LOG_LEVEL_DEBUG);
+#if defined(ARDUINO_ESP8266_RELEASE_2_3_0) || defined(ARDUINO_ESP8266_RELEASE_2_4_0) || defined(ARDUINO_ESP8266_RELEASE_2_4_1) || defined(ARDUINO_ESP8266_RELEASE_2_4_2)
           ota_result = (HTTP_UPDATE_FAILED != ESPhttpUpdate.update(mqtt_data));
+#else
+          // If using core stage or 2.5.0+ the syntax has changed
+          ota_result = (HTTP_UPDATE_FAILED != ESPhttpUpdate.update(EspClient, mqtt_data));
+#endif
           if (!ota_result) {
 #ifndef BE_MINIMAL
             int ota_error = ESPhttpUpdate.getLastError();