From c3359edb33f6e403efa5b8970bd60ebcb1e80079 Mon Sep 17 00:00:00 2001
From: Anton Viktorov <anton.viktorov@live.com>
Date: Wed, 3 Sep 2025 19:18:26 +0200
Subject: [PATCH] [i2c] Fix bug write_register16 (#10547)

---
 esphome/components/i2c/i2c.cpp | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/esphome/components/i2c/i2c.cpp b/esphome/components/i2c/i2c.cpp
index e66ab8ba73..48e1cf8aca 100644
--- a/esphome/components/i2c/i2c.cpp
+++ b/esphome/components/i2c/i2c.cpp
@@ -47,9 +47,9 @@ ErrorCode I2CDevice::write_register(uint8_t a_register, const uint8_t *data, siz
 
 ErrorCode I2CDevice::write_register16(uint16_t a_register, const uint8_t *data, size_t len) const {
   std::vector<uint8_t> v(len + 2);
-  v.push_back(a_register >> 8);
-  v.push_back(a_register);
-  v.insert(v.end(), data, data + len);
+  v[0] = a_register >> 8;
+  v[1] = a_register;
+  std::copy(data, data + len, v.begin() + 2);
   return bus_->write_readv(this->address_, v.data(), v.size(), nullptr, 0);
 }