diff --git a/homeassistant/components/rfxtrx/config_flow.py b/homeassistant/components/rfxtrx/config_flow.py
index 287e1ec4baf..596f1d0b5e9 100644
--- a/homeassistant/components/rfxtrx/config_flow.py
+++ b/homeassistant/components/rfxtrx/config_flow.py
@@ -20,4 +20,5 @@ class ConfigFlow(config_entries.ConfigFlow, domain=DOMAIN):
         if entry and import_config.items() != entry.data.items():
             self.hass.config_entries.async_update_entry(entry, data=import_config)
             return self.async_abort(reason="already_configured")
+        self._abort_if_unique_id_configured()
         return self.async_create_entry(title="RFXTRX", data=import_config)