diff --git a/uppsrc/Core/Core.upp b/uppsrc/Core/Core.upp
index 5a7d786fc..970a9a0c3 100644
--- a/uppsrc/Core/Core.upp
+++ b/uppsrc/Core/Core.upp
@@ -36,6 +36,7 @@ file
 	config.h,
 	Defs.h,
 	Cpu.cpp optimize_speed,
+	Mt.h,
 	Mt.cpp,
 	OL_Set.cpp,
 	Global.h,
@@ -50,7 +51,6 @@ file
 	StringFind.cpp,
 	String.cpp optimize_speed,
 	WString.cpp optimize_speed,
-	Mt.h,
 	StrUtil.cpp optimize_speed,
 	SplitMerge.h,
 	SplitMerge.cpp optimize_speed,