diff --git a/arch/ia64/hp/sim/simserial.c b/arch/ia64/hp/sim/simserial.c
index 0d324e85379ed15bbc2159c817f7368a969ecb99..35ae642b2a1ad4813948898c71168c546f2aada8 100644
--- a/arch/ia64/hp/sim/simserial.c
+++ b/arch/ia64/hp/sim/simserial.c
@@ -34,9 +34,12 @@
 #include <linux/sysrq.h>
 
 #include <asm/irq.h>
+#include <asm/hpsim.h>
 #include <asm/hw_irq.h>
 #include <asm/uaccess.h>
 
+#include "hpsim_ssc.h"
+
 #undef SIMSERIAL_DEBUG	/* define this to get some debug information */
 
 #define KEYBOARD_INTR	3	/* must match with simulator! */
@@ -45,11 +48,6 @@
 
 #define IRQ_T(info) ((info->flags & ASYNC_SHARE_IRQ) ? IRQF_SHARED : IRQF_DISABLED)
 
-#define SSC_GETCHAR	21
-
-extern long ia64_ssc (long, long, long, long, int);
-extern void ia64_ssc_connect_irq (long intr, long irq);
-
 static char *serial_name = "SimSerial driver";
 static char *serial_version = "0.6";