diff --git a/include/os/freebsd/spl/sys/vnode.h b/include/os/freebsd/spl/sys/vnode.h
index 10cb3663d..7f7084c24 100644
--- a/include/os/freebsd/spl/sys/vnode.h
+++ b/include/os/freebsd/spl/sys/vnode.h
@@ -91,6 +91,7 @@ vn_is_readonly(vnode_t *vp)
 	((vp)->v_object != NULL && \
 	(vp)->v_object->resident_page_count > 0)
 
+#ifndef IN_BASE
 static __inline void
 vn_flush_cached_data(vnode_t *vp, boolean_t sync)
 {
@@ -101,6 +102,7 @@ vn_flush_cached_data(vnode_t *vp, boolean_t sync)
 		zfs_vmobject_wunlock(vp->v_object);
 	}
 }
+#endif
 
 #define	vn_exists(vp)		do { } while (0)
 #define	vn_invalid(vp)		do { } while (0)