diff --git a/onchaind/onchain.c b/onchaind/onchain.c
index 6a88636bb..2d4914c22 100644
--- a/onchaind/onchain.c
+++ b/onchaind/onchain.c
@@ -1286,7 +1286,7 @@ int main(int argc, char *argv[])
 		status_failed(WIRE_ONCHAIN_BAD_COMMAND,
 			      "Can't allocate %"PRIu64" htlcs", num_htlcs);
 
-	for (size_t i = 0; i < num_htlcs; i++) {
+	for (u64 i = 0; i < num_htlcs; i++) {
 		msg = wire_sync_read(ctx, REQ_FD);
 		if (!msg || !fromwire_onchain_htlc(msg, NULL, &htlcs[i]))
 			status_failed(WIRE_ONCHAIN_BAD_COMMAND,
diff --git a/wallet/wallet.c b/wallet/wallet.c
index 923b9bb8c..9617b4956 100644
--- a/wallet/wallet.c
+++ b/wallet/wallet.c
@@ -31,7 +31,7 @@ bool wallet_add_utxo(struct wallet *w, struct utxo *utxo,
 	bool result = db_exec(
 	    __func__, w->db,
 	    "INSERT INTO outputs (prev_out_tx, prev_out_index, value, type, "
-	    "status, keyindex) VALUES ('%s', %d, %zu, %d, %d, %d);",
+	    "status, keyindex) VALUES ('%s', %d, %"PRIu64", %d, %d, %d);",
 	    hextxid, utxo->outnum, utxo->amount, type, output_state_available,
 	    utxo->keyindex);
 	tal_free(tmpctx);