diff --git a/arch/ia64/hp/sim/simserial.c b/arch/ia64/hp/sim/simserial.c
index 3698a2f..120aad4 100644
--- a/arch/ia64/hp/sim/simserial.c
+++ b/arch/ia64/hp/sim/simserial.c
@@ -27,10 +27,10 @@
 #include <linux/seq_file.h>
 #include <linux/slab.h>
 #include <linux/capability.h>
+#include <linux/circ_buf.h>
 #include <linux/console.h>
 #include <linux/module.h>
 #include <linux/serial.h>
-#include <linux/serialP.h>
 #include <linux/sysrq.h>
 
 #include <asm/irq.h>
@@ -46,6 +46,13 @@
 
 #define NR_PORTS	1	/* only one port for now */
 
+struct serial_state {
+	struct tty_port tport;
+	struct circ_buf xmit;
+	int irq;
+	int x_char;
+};
+
 static char *serial_name = "SimSerial driver";
 static char *serial_version = "0.6";
 
diff --git a/include/linux/serialP.h b/include/linux/serialP.h
index e5e8442..9a04dec 100644
--- a/include/linux/serialP.h
+++ b/include/linux/serialP.h
@@ -44,10 +44,8 @@
 	int			quot;
 	int			IER; 	/* Interrupt Enable Register */
 	int			MCR; 	/* Modem control register */
-	/* simserial */
 	int			x_char;	/* xon/xoff character */
  	struct circ_buf		xmit;
-	/* /simserial */
 	/* /amiserial */
 };