diff --git a/mm/src/boot/O2/padutils.c b/mm/src/boot/O2/padutils.c
index f8bf98cbe..b1c9a5202 100644
--- a/mm/src/boot/O2/padutils.c
+++ b/mm/src/boot/O2/padutils.c
@@ -1,5 +1,6 @@
 #include "padutils.h"
 #include <ultratypes.h>
+#include <string.h>
 
 void PadUtils_Init(Input* input) {
     memset(input, 0, sizeof(Input));