diff --git a/common/close_tx.c b/common/close_tx.c
index 017540b97..27e4f15f3 100644
--- a/common/close_tx.c
+++ b/common/close_tx.c
@@ -18,8 +18,19 @@ struct bitcoin_tx *create_close_tx(const tal_t *ctx,
 
 	assert(to_us + to_them <= anchor_satoshis);
 
+	/* BOLT #3:
+	 *
+	 * ## Closing Transaction
+	 *
+	 * Note that there are two possible variants for each node.
+	 *
+	 * * version: 1
+	 * * locktime: 0
+	 * * txin count: 1
+	 */
 	/* Now create close tx: one input, two outputs. */
 	tx = bitcoin_tx(ctx, 1, 2);
+	tx->version = 1;
 
 	/* Our input spends the anchor tx output. */
 	tx->input[0].txid = *anchor_txid;