diff --git a/esphome/components/mqtt/__init__.py b/esphome/components/mqtt/__init__.py
index 8851581ea0..b935e9b3ab 100644
--- a/esphome/components/mqtt/__init__.py
+++ b/esphome/components/mqtt/__init__.py
@@ -49,6 +49,7 @@ from esphome.const import (
     CONF_USERNAME,
     CONF_WILL_MESSAGE,
     PLATFORM_BK72XX,
+    PLATFORM_RTL87XX,
     PLATFORM_ESP32,
     PLATFORM_ESP8266,
 )
@@ -295,7 +296,7 @@ CONFIG_SCHEMA = cv.All(
         }
     ),
     validate_config,
-    cv.only_on([PLATFORM_ESP32, PLATFORM_ESP8266, PLATFORM_BK72XX]),
+    cv.only_on([PLATFORM_ESP32, PLATFORM_ESP8266, PLATFORM_BK72XX, PLATFORM_RTL87XX]),
 )