diff --git a/homeassistant/components/greeneye_monitor/const.py b/homeassistant/components/greeneye_monitor/const.py
index 40236b3219f..02c6d9845b0 100644
--- a/homeassistant/components/greeneye_monitor/const.py
+++ b/homeassistant/components/greeneye_monitor/const.py
@@ -1,5 +1,14 @@
 """Shared constants for the greeneye_monitor integration."""
 
+from __future__ import annotations
+
+from typing import TYPE_CHECKING
+
+from homeassistant.util.hass_dict import HassKey
+
+if TYPE_CHECKING:
+    from greeneye import Monitors
+
 CONF_CHANNELS = "channels"
 CONF_COUNTED_QUANTITY = "counted_quantity"
 CONF_COUNTED_QUANTITY_PER_PULSE = "counted_quantity_per_pulse"
@@ -13,8 +22,8 @@ CONF_TEMPERATURE_SENSORS = "temperature_sensors"
 CONF_TIME_UNIT = "time_unit"
 CONF_VOLTAGE_SENSORS = "voltage"
 
-DATA_GREENEYE_MONITOR = "greeneye_monitor"
 DOMAIN = "greeneye_monitor"
+DATA_GREENEYE_MONITOR: HassKey[Monitors] = HassKey(DOMAIN)
 
 SENSOR_TYPE_CURRENT = "current_sensor"
 SENSOR_TYPE_PULSE_COUNTER = "pulse_counter"
diff --git a/homeassistant/components/greeneye_monitor/sensor.py b/homeassistant/components/greeneye_monitor/sensor.py
index 04464fe2567..7cfc0e40fc0 100644
--- a/homeassistant/components/greeneye_monitor/sensor.py
+++ b/homeassistant/components/greeneye_monitor/sensor.py
@@ -109,7 +109,7 @@ async def async_setup_platform(
         if len(monitor_configs) == 0:
             monitors.remove_listener(on_new_monitor)
 
-    monitors: greeneye.Monitors = hass.data[DATA_GREENEYE_MONITOR]
+    monitors = hass.data[DATA_GREENEYE_MONITOR]
     monitors.add_listener(on_new_monitor)
     for monitor in monitors.monitors.values():
         on_new_monitor(monitor)