diff --git a/homeassistant/components/jewish_calendar/__init__.py b/homeassistant/components/jewish_calendar/__init__.py
index 8383f9181fc..81fe6cb5377 100644
--- a/homeassistant/components/jewish_calendar/__init__.py
+++ b/homeassistant/components/jewish_calendar/__init__.py
@@ -72,11 +72,14 @@ def get_unique_prefix(
     havdalah_offset: int | None,
 ) -> str:
     """Create a prefix for unique ids."""
+    # location.altitude was unset before 2024.6 when this method
+    # was used to create the unique id. As such it would always
+    # use the default altitude of 754.
     config_properties = [
         location.latitude,
         location.longitude,
         location.timezone,
-        location.altitude,
+        754,
         location.diaspora,
         language,
         candle_lighting_offset,
diff --git a/tests/components/jewish_calendar/test_init.py b/tests/components/jewish_calendar/test_init.py
index f052d4e7f46..b8454b41a60 100644
--- a/tests/components/jewish_calendar/test_init.py
+++ b/tests/components/jewish_calendar/test_init.py
@@ -38,7 +38,6 @@ async def test_import_unique_id_migration(hass: HomeAssistant) -> None:
         latitude=yaml_conf[DOMAIN][CONF_LATITUDE],
         longitude=yaml_conf[DOMAIN][CONF_LONGITUDE],
         timezone=hass.config.time_zone,
-        altitude=hass.config.elevation,
         diaspora=DEFAULT_DIASPORA,
     )
     old_prefix = get_unique_prefix(location, DEFAULT_LANGUAGE, 20, 50)