diff --git a/src/web/AmsWebServer.h b/src/web/AmsWebServer.h
index f2fbbe7c..00417d48 100644
--- a/src/web/AmsWebServer.h
+++ b/src/web/AmsWebServer.h
@@ -61,7 +61,11 @@ private:
 	bool performRestart = false;
 	bool performUpgrade = false;
 	bool rebootForUpgrade = false;
+	#if defined(AMS2MQTT_FIRMWARE_URL)
+	String customFirmwareUrl = AMS2MQTT_FIRMWARE_URL;
+	#else
 	String customFirmwareUrl;
+	#endif
 
     static const uint16_t BufferSize = 2048;
     char* buf;