diff --git a/homeassistant/components/slack/icons.json b/homeassistant/components/slack/icons.json
new file mode 100644
index 00000000000..5f09ed12fcc
--- /dev/null
+++ b/homeassistant/components/slack/icons.json
@@ -0,0 +1,9 @@
+{
+  "entity": {
+    "sensor": {
+      "do_not_disturb_until": {
+        "default": "mdi:clock"
+      }
+    }
+  }
+}
diff --git a/homeassistant/components/slack/sensor.py b/homeassistant/components/slack/sensor.py
index 4e65fdfc26d..0c99cdeedec 100644
--- a/homeassistant/components/slack/sensor.py
+++ b/homeassistant/components/slack/sensor.py
@@ -30,7 +30,6 @@ async def async_setup_entry(
                 SensorEntityDescription(
                     key="do_not_disturb_until",
                     translation_key="do_not_disturb_until",
-                    icon="mdi:clock",
                     device_class=SensorDeviceClass.TIMESTAMP,
                 ),
                 entry,