diff --git a/sys/include/sys/descrip.h b/sys/include/sys/descrip.h
index e94bee8..0a81a07 100644
--- a/sys/include/sys/descrip.h
+++ b/sys/include/sys/descrip.h
@@ -129,7 +129,7 @@
 };
 #endif
 
-int fcntl(struct thread *, struct fcntl_args *);
+int fcntl(struct thread*, struct sys_fcntl_args*);
 int close(struct thread *, struct close_args *);
 int falloc(struct thread *, struct file **, int *);
 int getdtablesize(struct thread *, struct getdtablesize_args *);