diff --git a/include/asm-powerpc/time.h b/include/asm-powerpc/time.h
index ce5de6e..febd581 100644
--- a/include/asm-powerpc/time.h
+++ b/include/asm-powerpc/time.h
@@ -33,6 +33,7 @@
 
 struct rtc_time;
 extern void to_tm(int tim, struct rtc_time * tm);
+extern void GregorianDay(struct rtc_time *tm);
 extern time_t last_rtc_update;
 
 extern void generic_calibrate_decr(void);