diff --git a/sys/ia64/ia64/interrupt.c b/sys/ia64/ia64/interrupt.c
index 961d9c2934b4..59dd36a4e95a 100644
--- a/sys/ia64/ia64/interrupt.c
+++ b/sys/ia64/ia64/interrupt.c
@@ -48,6 +48,7 @@
 #include <sys/ktr.h>
 #include <sys/mutex.h>
 
+#include <machine/clock.h>
 #include <machine/reg.h>
 #include <machine/frame.h>
 #include <machine/intr.h>
diff --git a/sys/ia64/include/clock.h b/sys/ia64/include/clock.h
index 9e4ad711df53..707422a2f9af 100644
--- a/sys/ia64/include/clock.h
+++ b/sys/ia64/include/clock.h
@@ -18,6 +18,7 @@ extern	int	adjkerntz;
 int	sysbeep __P((int pitch, int period));
 int	acquire_timer2 __P((int mode));
 int	release_timer2 __P((void));
+void	handleclock __P((void *arg));
 
 #endif