diff --git a/custom_components/eyeonwater/sensor.py b/custom_components/eyeonwater/sensor.py
index a425158..c89b02a 100644
--- a/custom_components/eyeonwater/sensor.py
+++ b/custom_components/eyeonwater/sensor.py
@@ -79,6 +79,9 @@ def __init__(
         """Initialize the sensor."""
         super().__init__(coordinator)
         self.meter = meter
+        chars = [c if c.isalnum() or c == "_" else "_" for c in meter.meter_uuid]
+        self._uuid = "".join(chars)
+
         self._state: pyonwater.DataPoint | None = None
         self._available = False
         self._historical_sensor = True