From a0b15d08bc56ccbea9990dde884136425e9886f7 Mon Sep 17 00:00:00 2001
From: Joel Challis <git@zvecr.com>
Date: Thu, 8 Jan 2026 05:36:40 +0000
Subject: [PATCH] Short term fix for avr-libc@2.3.0 (#25938)

---
 quantum/send_string/send_string.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/quantum/send_string/send_string.c b/quantum/send_string/send_string.c
index 602f24dabe..6471d5140c 100644
--- a/quantum/send_string/send_string.c
+++ b/quantum/send_string/send_string.c
@@ -281,6 +281,10 @@ void send_nibble(uint8_t number) {
     }
 }
 
+#if defined(__AVR_ATmega32U4__)
+#    include <avr/io.h>
+#endif
+
 void tap_random_base64(void) {
 #if defined(__AVR_ATmega32U4__)
     uint8_t key = (TCNT0 + TCNT1 + TCNT3 + TCNT4) % 64;