diff --git a/include/asm-x86_64/sembuf.h b/include/asm-x86_64/sembuf.h
new file mode 100644
index 0000000..63b5292
--- /dev/null
+++ b/include/asm-x86_64/sembuf.h
@@ -0,0 +1,25 @@
+#ifndef _X86_64_SEMBUF_H
+#define _X86_64_SEMBUF_H
+
+/* 
+ * The semid64_ds structure for x86_64 architecture.
+ * Note extra padding because this structure is passed back and forth
+ * between kernel and user space.
+ *
+ * Pad space is left for:
+ * - 64-bit time_t to solve y2038 problem
+ * - 2 miscellaneous 32-bit values
+ */
+
+struct semid64_ds {
+	struct ipc64_perm sem_perm;		/* permissions .. see ipc.h */
+	__kernel_time_t	sem_otime;		/* last semop time */
+	unsigned long	__unused1;
+	__kernel_time_t	sem_ctime;		/* last change time */
+	unsigned long	__unused2;
+	unsigned long	sem_nsems;		/* no. of semaphores in array */
+	unsigned long	__unused3;
+	unsigned long	__unused4;
+};
+
+#endif /* _X86_64_SEMBUF_H */