diff --git a/esphome/components/esphome/ota/ota_esphome.cpp b/esphome/components/esphome/ota/ota_esphome.cpp
index b39ab5222a..e2ccbf0c94 100644
--- a/esphome/components/esphome/ota/ota_esphome.cpp
+++ b/esphome/components/esphome/ota/ota_esphome.cpp
@@ -817,7 +817,6 @@ size_t ESPHomeOTAComponent::get_auth_hex_size_() const {
 
 void ESPHomeOTAComponent::cleanup_auth_() {
   this->auth_buf_ = nullptr;
-  this->auth_buf_size_ = 0;
   this->auth_buf_pos_ = 0;
   this->auth_type_ = 0;
 }