diff --git a/esphome/components/sgp40/sensor.py b/esphome/components/sgp40/sensor.py
index cb4231c168..ad9de6fe24 100644
--- a/esphome/components/sgp40/sensor.py
+++ b/esphome/components/sgp40/sensor.py
@@ -2,7 +2,7 @@ import esphome.config_validation as cv
 
 CODEOWNERS = ["@SenexCrenshaw"]
 
-CONFIG_SCHEMA = CONFIG_SCHEMA = cv.invalid(
+CONFIG_SCHEMA = cv.invalid(
     "SGP40 is deprecated.\nPlease use the SGP4x platform instead.\nSGP4x supports both SPG40 and SGP41.\n"
     " See https://esphome.io/components/sensor/sgp4x.html"
 )