diff --git a/homeassistant/components/mqtt/config_flow.py b/homeassistant/components/mqtt/config_flow.py
index 8e8953ab55f..0a26e2c52a0 100644
--- a/homeassistant/components/mqtt/config_flow.py
+++ b/homeassistant/components/mqtt/config_flow.py
@@ -3822,7 +3822,7 @@ class MQTTSubentryFlowHandler(ConfigSubentryFlow):
             full_entity_name = device_name
 
         self._async_update_component_data_defaults()
-        return self.async_create_entry(
+        result = self.async_create_entry(
             data=self._subentry_data,
             title=self._subentry_data[CONF_DEVICE][CONF_NAME],
             description_placeholders={
@@ -3830,6 +3830,8 @@ class MQTTSubentryFlowHandler(ConfigSubentryFlow):
                 CONF_PLATFORM: platform,
             },
         )
+        self.hass.config_entries.async_schedule_reload(self._get_entry().entry_id)
+        return result
 
     async def async_step_availability(
         self, user_input: dict[str, Any] | None = None