diff --git a/evrec/settings.py b/evrec/settings.py
index 8b0261a..638f5c4 100644
--- a/evrec/settings.py
+++ b/evrec/settings.py
@@ -18,7 +18,7 @@
 
 
 class MQTT(BaseModel):
-    broker: MqttUrl
+    broker: MqttUrl = Field(default="mqtt://localhost")
     username: str | None = None
     password: str | None = None
     topic_read: str
diff --git a/tests/test_mqtt.py b/tests/test_mqtt.py
index abcc19e..c816c15 100644
--- a/tests/test_mqtt.py
+++ b/tests/test_mqtt.py
@@ -1,12 +1,9 @@
 from evrec.server import EvrecServer
-from evrec.settings import Settings
+from evrec.settings import MQTT, Settings
 
 
 def test_server():
     settings = Settings(
-        clients_database="clients",
-        mqtt_broker=None,
-        mqtt_topic_read="read",
-        mqtt_topic_write="write",
+        clients_database="clients", mqtt=MQTT(topic_read="read", topic_write="write")
     )
     _ = EvrecServer(settings)