diff --git a/include/linux/futex.h b/include/linux/futex.h
index 966a5b3..8700332 100644
--- a/include/linux/futex.h
+++ b/include/linux/futex.h
@@ -1,8 +1,9 @@
 #ifndef _LINUX_FUTEX_H
 #define _LINUX_FUTEX_H
 
+#ifdef __KERNEL__
 #include <linux/sched.h>
-
+#endif
 /* Second argument to futex syscall */
 
 
@@ -12,6 +13,9 @@
 #define FUTEX_REQUEUE		3
 #define FUTEX_CMP_REQUEUE	4
 #define FUTEX_WAKE_OP		5
+#define FUTEX_LOCK_PI		6
+#define FUTEX_UNLOCK_PI		7
+#define FUTEX_TRYLOCK_PI	8
 
 /*
  * Support for robust futexes: the kernel cleans up held futexes at
@@ -90,6 +94,7 @@ struct robust_list_head {
  */
 #define ROBUST_LIST_LIMIT	2048
 
+#ifdef __KERNEL__
 long do_futex(unsigned long uaddr, int op, int val,
 		unsigned long timeout, unsigned long uaddr2, int val2,
 		int val3);
@@ -103,6 +108,7 @@ static inline void exit_robust_list(struct task_struct *curr)
 {
 }
 #endif
+#endif /* __KERNEL */
 
 #define FUTEX_OP_SET		0	/* *(int *)UADDR2 = OPARG; */
 #define FUTEX_OP_ADD		1	/* *(int *)UADDR2 += OPARG; */