diff --git a/src/Win/Time.cpp b/src/Win/Time.cpp
index e680fe0..01ac0db 100644
--- a/src/Win/Time.cpp
+++ b/src/Win/Time.cpp
@@ -1,5 +1,6 @@
 #include<hgl/platform/Platform.h>
 #include<hgl/TypeFunc.h>
+#include<hgl/math/TimeConst.h>
 
 namespace hgl
 {