diff --git a/configurations/home-assistant/configuration.yaml b/configurations/home-assistant/configuration.yaml
index f239c14..b13f87a 100644
--- a/configurations/home-assistant/configuration.yaml
+++ b/configurations/home-assistant/configuration.yaml
@@ -82,6 +82,6 @@ template:
         unit_of_measurement: "%"
         state_class: measurement
         state: >
-          {% set sensor_offset = 290 %}  {# same as above, = full tank height #}
+          {% set sensor_offset = 2090 %}  {# same as above, = full tank height #}
           {% set height = states('sensor.cistern_water_height') | float(0) %}
           {{ (height / sensor_offset * 100) | round(1) }}