diff --git a/esphome/components/mqtt/mqtt_lock.cpp b/esphome/components/mqtt/mqtt_lock.cpp
index b8fe3aa559..d01309343c 100644
--- a/esphome/components/mqtt/mqtt_lock.cpp
+++ b/esphome/components/mqtt/mqtt_lock.cpp
@@ -38,9 +38,10 @@ void MQTTLockComponent::dump_config() {
 std::string MQTTLockComponent::component_type() const { return "lock"; }
 const EntityBase *MQTTLockComponent::get_entity() const { return this->lock_; }
 void MQTTLockComponent::send_discovery(JsonObject root, mqtt::SendDiscoveryConfig &config) {
-  if (this->lock_->traits.get_assumed_state())
+  if (this->lock_->traits.get_assumed_state()) {
     // NOLINTNEXTLINE(clang-analyzer-cplusplus.NewDeleteLeaks) false positive with ArduinoJson
     root[MQTT_OPTIMISTIC] = true;
+  }
   if (this->lock_->traits.get_supports_open())
     root[MQTT_PAYLOAD_OPEN] = "OPEN";
 }
diff --git a/esphome/components/mqtt/mqtt_sensor.cpp b/esphome/components/mqtt/mqtt_sensor.cpp
index 455faed45c..b49f026e80 100644
--- a/esphome/components/mqtt/mqtt_sensor.cpp
+++ b/esphome/components/mqtt/mqtt_sensor.cpp
@@ -44,9 +44,10 @@ void MQTTSensorComponent::set_expire_after(uint32_t expire_after) { this->expire
 void MQTTSensorComponent::disable_expire_after() { this->expire_after_ = 0; }
 
 void MQTTSensorComponent::send_discovery(JsonObject root, mqtt::SendDiscoveryConfig &config) {
-  if (!this->sensor_->get_device_class().empty())
+  if (!this->sensor_->get_device_class().empty()) {
     // NOLINTNEXTLINE(clang-analyzer-cplusplus.NewDeleteLeaks) false positive with ArduinoJson
     root[MQTT_DEVICE_CLASS] = this->sensor_->get_device_class();
+  }
 
   if (!this->sensor_->get_unit_of_measurement().empty())
     root[MQTT_UNIT_OF_MEASUREMENT] = this->sensor_->get_unit_of_measurement();
diff --git a/esphome/components/mqtt/mqtt_switch.cpp b/esphome/components/mqtt/mqtt_switch.cpp
index 35da350b56..8c7a875c78 100644
--- a/esphome/components/mqtt/mqtt_switch.cpp
+++ b/esphome/components/mqtt/mqtt_switch.cpp
@@ -45,9 +45,10 @@ void MQTTSwitchComponent::dump_config() {
 std::string MQTTSwitchComponent::component_type() const { return "switch"; }
 const EntityBase *MQTTSwitchComponent::get_entity() const { return this->switch_; }
 void MQTTSwitchComponent::send_discovery(JsonObject root, mqtt::SendDiscoveryConfig &config) {
-  if (this->switch_->assumed_state())
+  if (this->switch_->assumed_state()) {
     // NOLINTNEXTLINE(clang-analyzer-cplusplus.NewDeleteLeaks) false positive with ArduinoJson
     root[MQTT_OPTIMISTIC] = true;
+  }
 }
 bool MQTTSwitchComponent::send_initial_state() { return this->publish_state(this->switch_->state); }
 
diff --git a/esphome/components/mqtt/mqtt_text_sensor.cpp b/esphome/components/mqtt/mqtt_text_sensor.cpp
index 8ee0bdb478..a65f7b8e91 100644
--- a/esphome/components/mqtt/mqtt_text_sensor.cpp
+++ b/esphome/components/mqtt/mqtt_text_sensor.cpp
@@ -15,9 +15,10 @@ using namespace esphome::text_sensor;
 
 MQTTTextSensor::MQTTTextSensor(TextSensor *sensor) : sensor_(sensor) {}
 void MQTTTextSensor::send_discovery(JsonObject root, mqtt::SendDiscoveryConfig &config) {
-  if (!this->sensor_->get_device_class().empty())
+  if (!this->sensor_->get_device_class().empty()) {
     // NOLINTNEXTLINE(clang-analyzer-cplusplus.NewDeleteLeaks) false positive with ArduinoJson
     root[MQTT_DEVICE_CLASS] = this->sensor_->get_device_class();
+  }
   config.command_topic = false;
 }
 void MQTTTextSensor::setup() {
diff --git a/esphome/components/mqtt/mqtt_valve.cpp b/esphome/components/mqtt/mqtt_valve.cpp
index 59761f87a8..8506db27cf 100644
--- a/esphome/components/mqtt/mqtt_valve.cpp
+++ b/esphome/components/mqtt/mqtt_valve.cpp
@@ -49,9 +49,10 @@ void MQTTValveComponent::dump_config() {
   }
 }
 void MQTTValveComponent::send_discovery(JsonObject root, mqtt::SendDiscoveryConfig &config) {
-  if (!this->valve_->get_device_class().empty())
+  if (!this->valve_->get_device_class().empty()) {
     // NOLINTNEXTLINE(clang-analyzer-cplusplus.NewDeleteLeaks) false positive with ArduinoJson
     root[MQTT_DEVICE_CLASS] = this->valve_->get_device_class();
+  }
 
   auto traits = this->valve_->get_traits();
   if (traits.get_is_assumed_state()) {