diff --git a/esphome/components/mqtt/mqtt_datetime.cpp b/esphome/components/mqtt/mqtt_datetime.cpp
index 4fa44aafb8..4ae6d0d416 100644
--- a/esphome/components/mqtt/mqtt_datetime.cpp
+++ b/esphome/components/mqtt/mqtt_datetime.cpp
@@ -6,12 +6,12 @@
 #include "mqtt_const.h"
 
 #ifdef USE_MQTT
-#ifdef USE_DATETIME_TIME
+#ifdef USE_DATETIME_DATETIME
 
 namespace esphome {
 namespace mqtt {
 
-static const char *const TAG = "mqtt.datetime.time";
+static const char *const TAG = "mqtt.datetime.datetime";
 
 using namespace esphome::datetime;
 
@@ -80,5 +80,5 @@ bool MQTTDateTimeComponent::publish_state(uint16_t year, uint8_t month, uint8_t
 }  // namespace mqtt
 }  // namespace esphome
 
-#endif  // USE_DATETIME_TIME
+#endif  // USE_DATETIME_DATETIME
 #endif  // USE_MQTT
diff --git a/esphome/components/mqtt/mqtt_datetime.h b/esphome/components/mqtt/mqtt_datetime.h
index f0d68ad2e1..ba81c06cb3 100644
--- a/esphome/components/mqtt/mqtt_datetime.h
+++ b/esphome/components/mqtt/mqtt_datetime.h
@@ -3,7 +3,7 @@
 #include "esphome/core/defines.h"
 
 #ifdef USE_MQTT
-#ifdef USE_DATETIME_TIME
+#ifdef USE_DATETIME_DATETIME
 
 #include "esphome/components/datetime/datetime_entity.h"
 #include "mqtt_component.h"
@@ -17,7 +17,7 @@ class MQTTDateTimeComponent : public mqtt::MQTTComponent {
    *
    * @param time The time entity.
    */
-  explicit MQTTDateTimeComponent(datetime::DateTimeEntity *time);
+  explicit MQTTDateTimeComponent(datetime::DateTimeEntity *datetime);
 
   // ========== INTERNAL METHODS ==========
   // (In most use cases you won't need these)
@@ -41,5 +41,5 @@ class MQTTDateTimeComponent : public mqtt::MQTTComponent {
 }  // namespace mqtt
 }  // namespace esphome
 
-#endif  // USE_DATETIME_DATE
+#endif  // USE_DATETIME_DATETIME
 #endif  // USE_MQTT