diff --git a/sys/compat/linuxkpi/common/include/linux/shrinker.h b/sys/compat/linuxkpi/common/include/linux/shrinker.h
--- a/sys/compat/linuxkpi/common/include/linux/shrinker.h
+++ b/sys/compat/linuxkpi/common/include/linux/shrinker.h
@@ -39,6 +39,7 @@
 	unsigned long		(*count_objects)(struct shrinker *, struct shrink_control *);
 	unsigned long		(*scan_objects)(struct shrinker *, struct shrink_control *);
 	int			seeks;
+	void *			private_data;
 	long			batch;
 	TAILQ_ENTRY(shrinker)	next;
 };