From 6122db55a9025b2ca4e968ff9a9987b50af405d7 Mon Sep 17 00:00:00 2001
From: "Dirk O. Kaar" <dok@dok-net.net>
Date: Wed, 9 Jun 2021 09:57:33 +0200
Subject: [PATCH] Normalize core header's include guard.

---
 cores/esp8266/core_esp8266_i2s.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/cores/esp8266/core_esp8266_i2s.h b/cores/esp8266/core_esp8266_i2s.h
index db572fa19c..07a18ef554 100644
--- a/cores/esp8266/core_esp8266_i2s.h
+++ b/cores/esp8266/core_esp8266_i2s.h
@@ -18,8 +18,8 @@
   License along with this library; if not, write to the Free Software
   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
-#ifndef I2S_h
-#define I2S_h
+#ifndef CORE_ESP8266_I2S_H
+#define CORE_ESP8266_I2S_H
 
 #define I2S_HAS_BEGIN_RXTX_DRIVE_CLOCKS 1