diff --git a/src/ObjWriting/Game/T6/Techset/TechsetDumperT6.cpp b/src/ObjWriting/Game/T6/Techset/TechsetDumperT6.cpp
index 8285281e..c578284b 100644
--- a/src/ObjWriting/Game/T6/Techset/TechsetDumperT6.cpp
+++ b/src/ObjWriting/Game/T6/Techset/TechsetDumperT6.cpp
@@ -2,6 +2,7 @@
 
 #include "Shader/ShaderCommon.h"
 
+#include <format>
 #include <nlohmann/json.hpp>
 #include <sstream>
 #include <unordered_set>