diff --git a/examples/mqtt.py b/examples/mqtt.py
index 28e59a2..c07d4ef 100644
--- a/examples/mqtt.py
+++ b/examples/mqtt.py
@@ -31,11 +31,11 @@ username = "mqtt-user"
 pw = "phio6yiR9ohs1veeghu4WaeGhaiRi8he4EiWasheev4faeku8tohdiuthah7zahP"
 client_id = "solarmonitor"
 
-value_pvProduction = 0
-value_wHouseConsumption = 0
-value_energyImportExport = 0
-value_houseBatterySoC = 0
-value_houseBatteryLoadUnload = 0
+value_pvProduction = "0"
+value_wHouseConsumption = "0"
+value_energyImportExport = "0"
+value_houseBatterySoC = "0"
+value_houseBatteryLoadUnload = "0"
 
 try:
     logging.info("epd2in13bc Demo")