diff --git a/homeassistant/components/rfxtrx/helpers.py b/homeassistant/components/rfxtrx/helpers.py
index 2badc6d4ca5..cfc16126359 100644
--- a/homeassistant/components/rfxtrx/helpers.py
+++ b/homeassistant/components/rfxtrx/helpers.py
@@ -6,6 +6,8 @@ from RFXtrx import RFXtrxDevice, get_device
 from homeassistant.core import HomeAssistant, callback
 from homeassistant.helpers import device_registry as dr
 
+from . import get_device_tuple_from_identifiers
+
 
 @callback
 def async_get_device_object(hass: HomeAssistant, device_id: str) -> RFXtrxDevice:
@@ -15,7 +17,9 @@ def async_get_device_object(hass: HomeAssistant, device_id: str) -> RFXtrxDevice
     if registry_device is None:
         raise ValueError(f"Device {device_id} not found")
 
-    device_tuple = list(list(registry_device.identifiers)[0])
+    device_tuple = get_device_tuple_from_identifiers(registry_device.identifiers)
+    assert device_tuple
+
     return get_device(
-        int(device_tuple[1], 16), int(device_tuple[2], 16), device_tuple[3]
+        int(device_tuple[0], 16), int(device_tuple[1], 16), device_tuple[2]
     )
diff --git a/tests/components/rfxtrx/test_device_action.py b/tests/components/rfxtrx/test_device_action.py
index 843f5a310ad..c4613d67282 100644
--- a/tests/components/rfxtrx/test_device_action.py
+++ b/tests/components/rfxtrx/test_device_action.py
@@ -89,6 +89,14 @@ async def test_get_actions(
     device_entry = device_registry.async_get_device(device.device_identifiers, set())
     assert device_entry
 
+    # Add alternate identifiers, to make sure we can handle future formats
+    identifiers: list[str] = list(*device_entry.identifiers)
+    device_registry.async_update_device(
+        device_entry.id, merge_identifiers={(identifiers[0], "_".join(identifiers[1:]))}
+    )
+    device_entry = device_registry.async_get_device(device.device_identifiers, set())
+    assert device_entry
+
     actions = await async_get_device_automations(
         hass, DeviceAutomationType.ACTION, device_entry.id
     )
diff --git a/tests/components/rfxtrx/test_device_trigger.py b/tests/components/rfxtrx/test_device_trigger.py
index 78d6748a117..c33e6c94f64 100644
--- a/tests/components/rfxtrx/test_device_trigger.py
+++ b/tests/components/rfxtrx/test_device_trigger.py
@@ -88,6 +88,15 @@ async def test_get_triggers(
     await setup_entry(hass, {event.code: {}})
 
     device_entry = device_registry.async_get_device(event.device_identifiers, set())
+    assert device_entry
+
+    # Add alternate identifiers, to make sure we can handle future formats
+    identifiers: list[str] = list(*event.device_identifiers)
+    device_registry.async_update_device(
+        device_entry.id, merge_identifiers={(identifiers[0], "_".join(identifiers[1:]))}
+    )
+    device_entry = device_registry.async_get_device(event.device_identifiers, set())
+    assert device_entry
 
     expected_triggers = [
         {