diff --git a/homeassistant/components/slack/sensor.py b/homeassistant/components/slack/sensor.py
index b190e6151ed..4e65fdfc26d 100644
--- a/homeassistant/components/slack/sensor.py
+++ b/homeassistant/components/slack/sensor.py
@@ -29,7 +29,7 @@ async def async_setup_entry(
                 hass.data[DOMAIN][entry.entry_id][SLACK_DATA],
                 SensorEntityDescription(
                     key="do_not_disturb_until",
-                    name="Do not disturb until",
+                    translation_key="do_not_disturb_until",
                     icon="mdi:clock",
                     device_class=SensorDeviceClass.TIMESTAMP,
                 ),
diff --git a/homeassistant/components/slack/strings.json b/homeassistant/components/slack/strings.json
index f14129cf156..13b48644ffd 100644
--- a/homeassistant/components/slack/strings.json
+++ b/homeassistant/components/slack/strings.json
@@ -25,5 +25,12 @@
     "abort": {
       "already_configured": "[%key:common::config_flow::abort::already_configured_service%]"
     }
+  },
+  "entity": {
+    "sensor": {
+      "do_not_disturb_until": {
+        "name": "Do not disturb until"
+      }
+    }
   }
 }