diff --git a/custom_components/xiaomi_miot/core/miio2miot_specs.py b/custom_components/xiaomi_miot/core/miio2miot_specs.py
index 304fa869b..7fd79fd84 100644
--- a/custom_components/xiaomi_miot/core/miio2miot_specs.py
+++ b/custom_components/xiaomi_miot/core/miio2miot_specs.py
@@ -2729,7 +2729,7 @@ def cbk(prop, params, props, **kwargs):
         'miio_specs': {
             'prop.4.2': {
                 'prop': 'f1_hour_used',
-                'template': '{{ value/(props.filter1_life|default(0,true)/100)-value }}',
+                'template': '{{ value/(props.filter1_life|default(1,true)/100)-value }}',
             },
         },
     },