diff --git a/quantum/matrix_common.c b/quantum/matrix_common.c
index 5fdc9186fa..98b83ddcf6 100644
--- a/quantum/matrix_common.c
+++ b/quantum/matrix_common.c
@@ -7,6 +7,7 @@
 #ifdef SPLIT_KEYBOARD
 #    include "split_common/split_util.h"
 #    include "split_common/transactions.h"
+#    include <string.h>
 
 #    define ROWS_PER_HAND (MATRIX_ROWS / 2)
 #else