diff --git a/custom_components/ble_monitor/manifest.json b/custom_components/ble_monitor/manifest.json
index 7bedaa54..d531d616 100644
--- a/custom_components/ble_monitor/manifest.json
+++ b/custom_components/ble_monitor/manifest.json
@@ -14,5 +14,5 @@
     "btsocket>=0.2.0",
     "pyric>=0.1.6.3"
   ],
-  "version": "12.9.0"
+  "version": "12.9.1"
 }
diff --git a/custom_components/ble_monitor/sensor.py b/custom_components/ble_monitor/sensor.py
index 262d483a..7ee9be1d 100644
--- a/custom_components/ble_monitor/sensor.py
+++ b/custom_components/ble_monitor/sensor.py
@@ -990,7 +990,7 @@ def collect(self, data, period_cnt, batt_attr=None):
             return
         self._state = data[self.entity_description.key]
         self._extra_state_attributes["sensor_type"] = data["type"]
-        self._extra_state_attributes["last_packet id"] = data["packet"]
+        self._extra_state_attributes["last_packet_id"] = data["packet"]
         self._extra_state_attributes["firmware"] = data["firmware"]
         self._extra_state_attributes['mac_address' if self.is_beacon else 'uuid'] = dict_get_or_normalize(
             data, CONF_MAC, CONF_UUID
@@ -1105,7 +1105,7 @@ def collect(self, data, period_cnt, batt_attr=None):
         else:
             self.pending_update = False
             return
-        self._extra_state_attributes["last_packet id"] = data["packet"]
+        self._extra_state_attributes["last_packet_id"] = data["packet"]
         self._extra_state_attributes["firmware"] = data["firmware"]
         self._extra_state_attributes['mac_address' if self.is_beacon else 'uuid'] = dict_get_or_normalize(
             data, CONF_MAC, CONF_UUID