From dc277e64f4359ef8b36f5fdcaf087f7e983d8967 Mon Sep 17 00:00:00 2001
From: "J. Nick Koston" <nick@home-assistant.io>
Date: Mon, 17 Nov 2025 18:00:15 -0600
Subject: [PATCH] tweak

---
 esphome/core/helpers.cpp | 7 +++++++
 esphome/core/helpers.h   | 7 +------
 2 files changed, 8 insertions(+), 6 deletions(-)

diff --git a/esphome/core/helpers.cpp b/esphome/core/helpers.cpp
index 664ae253f7..50af71649c 100644
--- a/esphome/core/helpers.cpp
+++ b/esphome/core/helpers.cpp
@@ -648,6 +648,13 @@ void get_mac_address_into_buffer(std::span<char, 13> buf) {
   format_mac_addr_lower_no_sep(mac, buf.data());
 }
 
+const char *get_mac_address_pretty_into_buffer(std::span<char, 18> buf) {
+  uint8_t mac[6];
+  get_mac_address_raw(mac);
+  format_mac_addr_upper(mac, buf.data());
+  return buf.data();
+}
+
 #ifndef USE_ESP32
 bool has_custom_mac_address() { return false; }
 #endif
diff --git a/esphome/core/helpers.h b/esphome/core/helpers.h
index 635a7d6a42..d8c1f4647e 100644
--- a/esphome/core/helpers.h
+++ b/esphome/core/helpers.h
@@ -1055,12 +1055,7 @@ void get_mac_address_into_buffer(std::span<char, 13> buf);
 /// Get the device MAC address into the given buffer, in colon-separated uppercase hex notation.
 /// Buffer must be exactly 18 bytes (17 for "XX:XX:XX:XX:XX:XX" + null terminator).
 /// Returns pointer to the buffer for convenience.
-inline const char *get_mac_address_pretty_into_buffer(std::span<char, 18> buf) {
-  uint8_t mac[6];
-  get_mac_address_raw(mac);
-  format_mac_addr_upper(mac, buf.data());
-  return buf.data();
-}
+const char *get_mac_address_pretty_into_buffer(std::span<char, 18> buf);
 
 #ifdef USE_ESP32
 /// Set the MAC address to use from the provided byte array (6 bytes).