diff --git a/Samples/multimedia/directshow/baseclasses/refclock.h b/Samples/multimedia/directshow/baseclasses/refclock.h
index d2b0bb1..2a8d384 100644
--- a/Samples/multimedia/directshow/baseclasses/refclock.h
+++ b/Samples/multimedia/directshow/baseclasses/refclock.h
@@ -10,7 +10,7 @@
 #ifndef __BASEREFCLOCK__
 #define __BASEREFCLOCK__
 
-#include <Schedule.h>
+#include "Schedule.h"
 
 const UINT RESOLUTION = 1;                      /* High resolution timer */
 const INT ADVISE_CACHE = 4;                     /* Default cache size */