1 files changed, 3 insertions, 1 deletions

diff --git a/include/asm-i386/mach-default/mach_timer.h b/include/asm-i386/mach-default/mach_timer.h
index 4b9703bb0288..807992fd4171 100644
--- a/include/asm-i386/mach-default/mach_timer.h
+++ b/include/asm-i386/mach-default/mach_timer.h
@@ -15,7 +15,9 @@
 #ifndef _MACH_TIMER_H
 #define _MACH_TIMER_H
 
-#define CALIBRATE_LATCH (5 * LATCH)
+#define CALIBRATE_TIME_MSEC 30 /* 30 msecs */
+#define CALIBRATE_LATCH \
+        ((CLOCK_TICK_RATE * CALIBRATE_TIME_MSEC + 1000/2)/1000)
 
 static inline void mach_prepare_counter(void)
 {