diff --git a/homeassistant/components/ambient_station/__init__.py b/homeassistant/components/ambient_station/__init__.py
index c61e15dfeb5..0bbb7a760fe 100644
--- a/homeassistant/components/ambient_station/__init__.py
+++ b/homeassistant/components/ambient_station/__init__.py
@@ -378,7 +378,7 @@ class AmbientStation:
             if data != self.stations[mac_address][ATTR_LAST_DATA]:
                 _LOGGER.debug("New data received: %s", data)
                 self.stations[mac_address][ATTR_LAST_DATA] = data
-                async_dispatcher_send(self._hass, TOPIC_UPDATE)
+                async_dispatcher_send(self._hass, TOPIC_UPDATE.format(mac_address))
 
             _LOGGER.debug("Resetting watchdog")
             self._watchdog_listener()
@@ -518,7 +518,7 @@ class AmbientWeatherEntity(Entity):
             self.async_schedule_update_ha_state(True)
 
         self._async_unsub_dispatcher_connect = async_dispatcher_connect(
-            self.hass, TOPIC_UPDATE, update
+            self.hass, TOPIC_UPDATE.format(self._mac_address), update
         )
 
     async def async_will_remove_from_hass(self):
diff --git a/homeassistant/components/ambient_station/const.py b/homeassistant/components/ambient_station/const.py
index 21a6e514b30..4f94e1cfe88 100644
--- a/homeassistant/components/ambient_station/const.py
+++ b/homeassistant/components/ambient_station/const.py
@@ -8,7 +8,7 @@ CONF_APP_KEY = "app_key"
 
 DATA_CLIENT = "data_client"
 
-TOPIC_UPDATE = "update"
+TOPIC_UPDATE = "ambient_station_data_update_{0}"
 
 TYPE_BINARY_SENSOR = "binary_sensor"
 TYPE_SENSOR = "sensor"