diff --git a/MagickCore/timer.c b/MagickCore/timer.c
index c42f23b..56ee58c 100644
--- a/MagickCore/timer.c
+++ b/MagickCore/timer.c
@@ -45,6 +45,7 @@
 #include "MagickCore/exception-private.h"
 #include "MagickCore/log.h"
 #include "MagickCore/memory_.h"
+#include "MagickCore/nt-base-private.h"
 #include "MagickCore/timer.h"
 
 /*