diff --git a/net/netfilter/nft_dynset.c b/net/netfilter/nft_dynset.c
index 4990f7cbfafd..5c84a968dae2 100644
--- a/net/netfilter/nft_dynset.c
+++ b/net/netfilter/nft_dynset.c
@@ -204,8 +204,10 @@ static int nft_dynset_init(const struct nft_ctx *ctx,
 		nft_set_ext_add_length(&priv->tmpl, NFT_SET_EXT_EXPR,
 				       priv->expr->ops->size);
 	if (set->flags & NFT_SET_TIMEOUT) {
-		if (timeout || set->timeout)
+		if (timeout || set->timeout) {
+			nft_set_ext_add(&priv->tmpl, NFT_SET_EXT_TIMEOUT);
 			nft_set_ext_add(&priv->tmpl, NFT_SET_EXT_EXPIRATION);
+		}
 	}
 
 	priv->timeout = timeout;