diff --git a/src/core/file_sys/fssystem/fssystem_aes_xts_storage.h b/src/core/file_sys/fssystem/fssystem_aes_xts_storage.h
index f342efb57..0e83ca1b9 100644
--- a/src/core/file_sys/fssystem/fssystem_aes_xts_storage.h
+++ b/src/core/file_sys/fssystem/fssystem_aes_xts_storage.h
@@ -3,6 +3,7 @@
 
 #pragma once
 
+#include <mutex>
 #include <optional>
 
 #include "core/crypto/aes_util.h"