diff --git a/quantum/split_common/split_util.c b/quantum/split_common/split_util.c
index 09a307b8ed..d7ed6989f6 100644
--- a/quantum/split_common/split_util.c
+++ b/quantum/split_common/split_util.c
@@ -32,6 +32,7 @@ bool is_keyboard_left(void) {
   return is_keyboard_master();
 }
 
+__attribute__((weak))
 bool is_keyboard_master(void)
 {
 #ifdef __AVR__