diff --git a/homeassistant/components/cert_expiry/__init__.py b/homeassistant/components/cert_expiry/__init__.py
index 717a55b2027..2387c2a73c3 100644
--- a/homeassistant/components/cert_expiry/__init__.py
+++ b/homeassistant/components/cert_expiry/__init__.py
@@ -7,21 +7,21 @@ from homeassistant.const import CONF_HOST, CONF_PORT, Platform
 from homeassistant.core import HomeAssistant
 from homeassistant.helpers.start import async_at_started
 
-from .const import DOMAIN
 from .coordinator import CertExpiryDataUpdateCoordinator
 
 PLATFORMS = [Platform.SENSOR]
 
+CertExpiryConfigEntry = ConfigEntry[CertExpiryDataUpdateCoordinator]
 
-async def async_setup_entry(hass: HomeAssistant, entry: ConfigEntry) -> bool:
+
+async def async_setup_entry(hass: HomeAssistant, entry: CertExpiryConfigEntry) -> bool:
     """Load the saved entities."""
     host: str = entry.data[CONF_HOST]
     port: int = entry.data[CONF_PORT]
 
     coordinator = CertExpiryDataUpdateCoordinator(hass, host, port)
 
-    hass.data.setdefault(DOMAIN, {})
-    hass.data[DOMAIN][entry.entry_id] = coordinator
+    entry.runtime_data = coordinator
 
     if entry.unique_id is None:
         hass.config_entries.async_update_entry(entry, unique_id=f"{host}:{port}")
diff --git a/homeassistant/components/cert_expiry/sensor.py b/homeassistant/components/cert_expiry/sensor.py
index 6a55e630a35..674f7bb6341 100644
--- a/homeassistant/components/cert_expiry/sensor.py
+++ b/homeassistant/components/cert_expiry/sensor.py
@@ -12,7 +12,7 @@ from homeassistant.components.sensor import (
     SensorDeviceClass,
     SensorEntity,
 )
-from homeassistant.config_entries import SOURCE_IMPORT, ConfigEntry
+from homeassistant.config_entries import SOURCE_IMPORT
 from homeassistant.const import CONF_HOST, CONF_PORT, EVENT_HOMEASSISTANT_START
 from homeassistant.core import Event, HomeAssistant, callback
 import homeassistant.helpers.config_validation as cv
@@ -22,7 +22,7 @@ from homeassistant.helpers.event import async_call_later
 from homeassistant.helpers.typing import ConfigType, DiscoveryInfoType
 from homeassistant.helpers.update_coordinator import CoordinatorEntity
 
-from . import CertExpiryDataUpdateCoordinator
+from . import CertExpiryConfigEntry, CertExpiryDataUpdateCoordinator
 from .const import DEFAULT_PORT, DOMAIN
 
 SCAN_INTERVAL = timedelta(hours=12)
@@ -62,15 +62,13 @@ async def async_setup_platform(
 
 async def async_setup_entry(
     hass: HomeAssistant,
-    entry: ConfigEntry,
+    entry: CertExpiryConfigEntry,
     async_add_entities: AddEntitiesCallback,
 ) -> None:
     """Add cert-expiry entry."""
-    coordinator: CertExpiryDataUpdateCoordinator = hass.data[DOMAIN][entry.entry_id]
+    coordinator = entry.runtime_data
 
-    sensors = [
-        SSLCertificateTimestamp(coordinator),
-    ]
+    sensors = [SSLCertificateTimestamp(coordinator)]
 
     async_add_entities(sensors, True)