diff --git a/homeassistant/components/rfxtrx/config_flow.py b/homeassistant/components/rfxtrx/config_flow.py
index 61d01b8d533..508ca9a7037 100644
--- a/homeassistant/components/rfxtrx/config_flow.py
+++ b/homeassistant/components/rfxtrx/config_flow.py
@@ -199,7 +199,7 @@ class OptionsFlow(config_entries.OptionsFlow):
             if not errors:
                 devices = {}
                 device = {
-                    CONF_DEVICE_ID: device_id,
+                    CONF_DEVICE_ID: list(device_id),
                 }
 
                 devices[self._selected_device_event_code] = device
diff --git a/tests/components/rfxtrx/test_config_flow.py b/tests/components/rfxtrx/test_config_flow.py
index 2c695d71d2e..eaa7f1c79a1 100644
--- a/tests/components/rfxtrx/test_config_flow.py
+++ b/tests/components/rfxtrx/test_config_flow.py
@@ -867,6 +867,9 @@ async def test_options_configure_rfy_cover_device(hass):
         entry.data["devices"]["0C1a0000010203010000000000"]["venetian_blind_mode"]
         == "EU"
     )
+    assert isinstance(
+        entry.data["devices"]["0C1a0000010203010000000000"]["device_id"], list
+    )
 
     device_registry = dr.async_get(hass)
     device_entries = dr.async_entries_for_config_entry(device_registry, entry.entry_id)
@@ -904,6 +907,9 @@ async def test_options_configure_rfy_cover_device(hass):
         entry.data["devices"]["0C1a0000010203010000000000"]["venetian_blind_mode"]
         == "EU"
     )
+    assert isinstance(
+        entry.data["devices"]["0C1a0000010203010000000000"]["device_id"], list
+    )
 
 
 def test_get_serial_by_id_no_dir():