diff --git a/src/main.cpp b/src/main.cpp
index 955ecfe..d871be4 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -430,6 +430,7 @@ void setup() {
     json["address_inverter"] = address_inverter;
     json["address_battery"] = address_battery;
     json["address_outside_temperature"] = address_outside_temperature;
+    json["display_language"] = display_lang;
 
     File configFile = Flash.open("/config.json", "w");
     if (!configFile) {