diff --git a/homeassistant/components/jewish_calendar/entity.py b/homeassistant/components/jewish_calendar/entity.py
index aba76599f63..c11925df954 100644
--- a/homeassistant/components/jewish_calendar/entity.py
+++ b/homeassistant/components/jewish_calendar/entity.py
@@ -28,7 +28,7 @@ class JewishCalendarEntity(Entity):
     ) -> None:
         """Initialize a Jewish Calendar entity."""
         self.entity_description = description
-        self._attr_unique_id = f"{config_entry.entry_id}_{description.key}"
+        self._attr_unique_id = f"{config_entry.entry_id}-{description.key}"
         self._attr_device_info = DeviceInfo(
             entry_type=DeviceEntryType.SERVICE,
             identifiers={(DOMAIN, config_entry.entry_id)},