diff --git a/sys/ufs/ufs/acl.h b/sys/ufs/ufs/acl.h
index 07075db91745..12da6d480416 100644
--- a/sys/ufs/ufs/acl.h
+++ b/sys/ufs/ufs/acl.h
@@ -39,6 +39,8 @@
 
 #ifdef _KERNEL
 
+struct inode;
+
 int	ufs_getacl_nfs4_internal(struct vnode *vp, struct acl *aclp,
 	    struct thread *td);
 int	ufs_setacl_nfs4_internal(struct vnode *vp, struct acl *aclp,