diff --git a/homeassistant/components/mold_indicator/config_flow.py b/homeassistant/components/mold_indicator/config_flow.py
index cc8f05c102d..ac85d7cc100 100644
--- a/homeassistant/components/mold_indicator/config_flow.py
+++ b/homeassistant/components/mold_indicator/config_flow.py
@@ -44,7 +44,7 @@ async def validate_duplicate(
 DATA_SCHEMA_OPTIONS = vol.Schema(
     {
         vol.Required(CONF_CALIBRATION_FACTOR): NumberSelector(
-            NumberSelectorConfig(min=0, step="any", mode=NumberSelectorMode.BOX)
+            NumberSelectorConfig(step=0.1, mode=NumberSelectorMode.BOX)
         )
     }
 )