diff --git a/arch/powerpc/include/asm/time.h b/arch/powerpc/include/asm/time.h
index b240666b7bc1..a7a8a9ac5991 100644
--- a/arch/powerpc/include/asm/time.h
+++ b/arch/powerpc/include/asm/time.h
@@ -31,6 +31,7 @@ extern void to_tm(int tim, struct rtc_time * tm);
 extern void tick_broadcast_ipi_handler(void);
 
 extern void generic_calibrate_decr(void);
+extern void hdec_interrupt(struct pt_regs *regs);
 
 /* Some sane defaults: 125 MHz timebase, 1GHz processor */
 extern unsigned long ppc_proc_freq;