diff --git a/sys/sys/event.h b/sys/sys/event.h
index e6e73dee6f90..9ccaabad9aab 100644
--- a/sys/sys/event.h
+++ b/sys/sys/event.h
@@ -259,30 +259,30 @@ struct knlist;
 struct mtx;
 struct rwlock;
 
-extern void	knote(struct knlist *list, long hint, int lockflags);
-extern void	knote_fork(struct knlist *list, int pid);
-extern struct knlist *knlist_alloc(struct mtx *lock);
-extern void	knlist_detach(struct knlist *knl);
-extern void	knlist_add(struct knlist *knl, struct knote *kn, int islocked);
-extern void	knlist_remove(struct knlist *knl, struct knote *kn, int islocked);
-extern int	knlist_empty(struct knlist *knl);
-extern void	knlist_init(struct knlist *knl, void *lock,
-    void (*kl_lock)(void *), void (*kl_unlock)(void *),
-    void (*kl_assert_locked)(void *), void (*kl_assert_unlocked)(void *));
-extern void	knlist_init_mtx(struct knlist *knl, struct mtx *lock);
-extern void	knlist_init_rw_reader(struct knlist *knl, struct rwlock *lock);
-extern void	knlist_destroy(struct knlist *knl);
-extern void	knlist_cleardel(struct knlist *knl, struct thread *td,
-	int islocked, int killkn);
+void	knote(struct knlist *list, long hint, int lockflags);
+void	knote_fork(struct knlist *list, int pid);
+struct knlist *knlist_alloc(struct mtx *lock);
+void	knlist_detach(struct knlist *knl);
+void	knlist_add(struct knlist *knl, struct knote *kn, int islocked);
+void	knlist_remove(struct knlist *knl, struct knote *kn, int islocked);
+int	knlist_empty(struct knlist *knl);
+void	knlist_init(struct knlist *knl, void *lock, void (*kl_lock)(void *),
+	    void (*kl_unlock)(void *), void (*kl_assert_locked)(void *),
+	    void (*kl_assert_unlocked)(void *));
+void	knlist_init_mtx(struct knlist *knl, struct mtx *lock);
+void	knlist_init_rw_reader(struct knlist *knl, struct rwlock *lock);
+void	knlist_destroy(struct knlist *knl);
+void	knlist_cleardel(struct knlist *knl, struct thread *td,
+	    int islocked, int killkn);
 #define knlist_clear(knl, islocked)				\
-		knlist_cleardel((knl), NULL, (islocked), 0)
+	knlist_cleardel((knl), NULL, (islocked), 0)
 #define knlist_delete(knl, td, islocked)			\
-		knlist_cleardel((knl), (td), (islocked), 1)
-extern void	knote_fdclose(struct thread *p, int fd);
-extern int 	kqfd_register(int fd, struct kevent *kev, struct thread *p,
-		    int waitok);
-extern int	kqueue_add_filteropts(int filt, struct filterops *filtops);
-extern int	kqueue_del_filteropts(int filt);
+	knlist_cleardel((knl), (td), (islocked), 1)
+void	knote_fdclose(struct thread *p, int fd);
+int 	kqfd_register(int fd, struct kevent *kev, struct thread *p,
+	    int waitok);
+int	kqueue_add_filteropts(int filt, struct filterops *filtops);
+int	kqueue_del_filteropts(int filt);
 
 #else 	/* !_KERNEL */