diff --git a/include/linux/timex.h b/include/linux/timex.h
index 1ba3071..19bb653 100644
--- a/include/linux/timex.h
+++ b/include/linux/timex.h
@@ -303,8 +303,10 @@
 
 #endif /* !CONFIG_TIME_INTERPOLATION */
 
+#define TICK_LENGTH_SHIFT	32
+
 /* Returns how long ticks are at present, in ns / 2^(SHIFT_SCALE-10). */
-extern u64 current_tick_length(long);
+extern u64 current_tick_length(void);
 
 extern int do_adjtimex(struct timex *);