diff -Naurd old/kernel/timer.c linux/kernel/timer.c
--- old/kernel/timer.c  2003-07-18 17:27:01.000000000 -0400
+++ linux/kernel/timer.c    2003-07-18 17:32:19.000000000 -0400
@@ -606,6 +606,15 @@
     else
    time_adj += (time_adj >> 2) + (time_adj >> 5);
 #endif
+#if HZ == 1000
+    /* Compensate for (HZ==1000) != (1 << SHIFT_HZ).
+     * Add 1.5625% and 0.78125% to get 1023.4375; => only 0.05% error (p. 14)
+     */
+    if (time_adj < 0)
+   time_adj -= (-time_adj >> 6) + (-time_adj >> 7);
+    else
+   time_adj += (time_adj >> 6) + (time_adj >> 7);
+#endif
 }
 
 /* in the NTP reference this is called "hardclock()" */