diff --git a/tests/components/mqtt/test_init.py b/tests/components/mqtt/test_init.py
index be1304cdbfe..08f1d8ca099 100644
--- a/tests/components/mqtt/test_init.py
+++ b/tests/components/mqtt/test_init.py
@@ -214,6 +214,7 @@ async def test_mqtt_await_ack_at_disconnect(
             0,
             False,
         )
+        await hass.async_block_till_done(wait_background_tasks=True)
 
 
 async def test_publish(