diff --git a/net/sched/act_mirred.c b/net/sched/act_mirred.c
index 553342c55cf7..1c98e4d81ebe 100644
--- a/net/sched/act_mirred.c
+++ b/net/sched/act_mirred.c
@@ -607,7 +607,8 @@ tcf_mirred_get_dev(const struct tc_action *a,
 
 static size_t tcf_mirred_get_fill_size(const struct tc_action *act)
 {
-	return nla_total_size(sizeof(struct tc_mirred));
+	return nla_total_size(sizeof(struct tc_mirred)) /* TCA_MIRRED_PARMS */
+		+ nla_total_size(sizeof(u32)); /* TCA_MIRRED_BLOCKID */
 }
 
 static void tcf_offload_mirred_get_dev(struct flow_action_entry *entry,