diff --git a/SilentPatch/Timer.h b/SilentPatch/Timer.h
index 64a527c..86aab3c 100644
--- a/SilentPatch/Timer.h
+++ b/SilentPatch/Timer.h
@@ -1,6 +1,8 @@
 #ifndef __TIMER
 #define __TIMER
 
+#include <cmath>
+
 class CTimer
 {
 public:
@@ -16,4 +18,4 @@ public:
 	static void				Update_SilentPatch();
 };
 
-#endif
\ No newline at end of file
+#endif