diff --git a/include/linux/pps_kernel.h b/include/linux/pps_kernel.h
index e0a193f..23f63c3 100644
--- a/include/linux/pps_kernel.h
+++ b/include/linux/pps_kernel.h
@@ -18,6 +18,9 @@
  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */
 
+#ifndef LINUX_PPS_KERNEL_H
+#define LINUX_PPS_KERNEL_H
+
 #include <linux/pps.h>
 
 #include <linux/cdev.h>
@@ -71,7 +74,6 @@
 
 extern spinlock_t pps_idr_lock;
 extern struct idr pps_idr;
-extern struct timespec pps_irq_ts[];
 
 extern struct device_attribute pps_attrs[];
 
@@ -87,3 +89,5 @@
 extern int pps_register_cdev(struct pps_device *pps);
 extern void pps_unregister_cdev(struct pps_device *pps);
 extern void pps_event(int source, struct pps_ktime *ts, int event, void *data);
+
+#endif /* LINUX_PPS_KERNEL_H */