diff --git a/net/batman-adv/translation-table.c b/net/batman-adv/translation-table.c
index 760d51fdbdf6..7d5de4cbb814 100644
--- a/net/batman-adv/translation-table.c
+++ b/net/batman-adv/translation-table.c
@@ -3959,23 +3959,21 @@ static void batadv_tt_tvlv_ogm_handler_v1(struct batadv_priv *bat_priv,
 	struct batadv_tvlv_tt_change *tt_change;
 	struct batadv_tvlv_tt_data *tt_data;
 	u16 num_entries, num_vlan;
-	size_t flex_size;
+	size_t tt_data_sz;
 
 	if (tvlv_value_len < sizeof(*tt_data))
 		return;
 
 	tt_data = tvlv_value;
-	tvlv_value_len -= sizeof(*tt_data);
-
 	num_vlan = ntohs(tt_data->num_vlan);
 
-	flex_size = flex_array_size(tt_data, vlan_data, num_vlan);
-	if (tvlv_value_len < flex_size)
+	tt_data_sz = struct_size(tt_data, vlan_data, num_vlan);
+	if (tvlv_value_len < tt_data_sz)
 		return;
 
 	tt_change = (struct batadv_tvlv_tt_change *)((void *)tt_data
-						     + flex_size);
-	tvlv_value_len -= flex_size;
+						     + tt_data_sz);
+	tvlv_value_len -= tt_data_sz;
 
 	num_entries = batadv_tt_entries(tvlv_value_len);