diff --git a/esphome/components/mqtt/mqtt_backend_libretiny.h b/esphome/components/mqtt/mqtt_backend_libretiny.h
index 5373a1926a..ac4d4298fc 100644
--- a/esphome/components/mqtt/mqtt_backend_libretiny.h
+++ b/esphome/components/mqtt/mqtt_backend_libretiny.h
@@ -19,9 +19,7 @@ class MQTTBackendLibreTiny final : public MQTTBackend {
   void set_will(const char *topic, uint8_t qos, bool retain, const char *payload) final {
     mqtt_client_.setWill(topic, qos, retain, payload);
   }
-  void set_server(network::IPAddress ip, uint16_t port) final {
-    mqtt_client_.setServer(IPAddress(static_cast<uint32_t>(ip)), port);
-  }
+  void set_server(network::IPAddress ip, uint16_t port) final { mqtt_client_.setServer(IPAddress(ip), port); }
   void set_server(const char *host, uint16_t port) final { mqtt_client_.setServer(host, port); }
 #if ASYNC_TCP_SSL_ENABLED
   void set_secure(bool secure) { mqtt_client.setSecure(secure); }
diff --git a/tests/test9.yaml b/tests/test9.yaml
index ccf5f4b5b0..d660b4f24a 100644
--- a/tests/test9.yaml
+++ b/tests/test9.yaml
@@ -26,3 +26,9 @@ sensor:
     name: ADC
     pin: GPIO23
     update_interval: 1s
+
+mqtt:
+  broker: test.mosquitto.org
+  port: 1883
+  discovery: true
+  discovery_prefix: homeassistant