diff --git a/include/asm-arm/arch-ixp4xx/timex.h b/include/asm-arm/arch-ixp4xx/timex.h
index 38c9d77..3745e35 100644
--- a/include/asm-arm/arch-ixp4xx/timex.h
+++ b/include/asm-arm/arch-ixp4xx/timex.h
@@ -7,7 +7,9 @@
 
 /*
  * We use IXP425 General purpose timer for our timer needs, it runs at 
- * 66.66... MHz
+ * 66.66... MHz. We do a convulted calculation of CLOCK_TICK_RATE b/c the
+ * timer register ignores the bottom 2 bits of the LATCH value.
  */
-#define CLOCK_TICK_RATE (66666666)
+#define FREQ 66666666
+#define CLOCK_TICK_RATE (((FREQ / HZ & ~IXP4XX_OST_RELOAD_MASK) + 1) * HZ)