From 127ac961d2fb293ef07499b3b2e6d6bf590eb64a Mon Sep 17 00:00:00 2001
From: Garrett Smith <smith.garrett.c@gmail.com>
Date: Sun, 18 Jan 2026 12:01:53 -0800
Subject: [PATCH] include <mutex> to fix windows build

---
 ultramodern/src/save.cpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/ultramodern/src/save.cpp b/ultramodern/src/save.cpp
index 5b1b69e..74f6927 100644
--- a/ultramodern/src/save.cpp
+++ b/ultramodern/src/save.cpp
@@ -1,4 +1,5 @@
 #include <filesystem>
+#include <mutex>
 #include <thread>
 #include <vector>
 #include <ultramodern/files.hpp>