diff --git a/daemon/bitcoind.c b/daemon/bitcoind.c
index dc2a28e1f..bc010d80e 100644
--- a/daemon/bitcoind.c
+++ b/daemon/bitcoind.c
@@ -30,18 +30,9 @@ static char **gather_args(struct bitcoind *bitcoind,
 	size_t n = 0;
 	char **args = tal_arr(ctx, char *, 3);
 
-	args[n++] = BITCOIN_CLI;
-	switch (bitcoind->testmode) {
-	case BITCOIND_REGTEST:
-		args[n++] = "-regtest=1";
-		break;
-	case BITCOIND_TESTNET:
-		args[n++] = "-testnet=1";
-		break;
-	case BITCOIND_MAINNET:
-		args[n++] = "-testnet=0";
-		break;
-	}
+	args[n++] = bitcoind->chainparams->cli;
+	args[n++] = bitcoind->chainparams->cli_args;
+
 	if (bitcoind->datadir) {
 		args[n++] = tal_fmt(args, "-datadir=%s", bitcoind->datadir);
 		tal_resize(&args, n + 1);
@@ -458,7 +449,8 @@ struct bitcoind *new_bitcoind(const tal_t *ctx, struct log *log)
 {
 	struct bitcoind *bitcoind = tal(ctx, struct bitcoind);
 
-	bitcoind->testmode = BITCOIND_TESTNET;
+	/* Use testnet by default, change later if we want another network */
+	bitcoind->chainparams = chainparams_for_network("testnet");
 	bitcoind->datadir = NULL;
 	bitcoind->log = log;
 	bitcoind->req_running = false;
diff --git a/daemon/bitcoind.h b/daemon/bitcoind.h
index 3145d6bb9..0b0dcf432 100644
--- a/daemon/bitcoind.h
+++ b/daemon/bitcoind.h
@@ -1,6 +1,7 @@
 #ifndef LIGHTNING_DAEMON_BITCOIND_H
 #define LIGHTNING_DAEMON_BITCOIND_H
 #include "config.h"
+#include <bitcoin/chainparams.h>
 #include <ccan/list/list.h>
 #include <ccan/short_types/short_types.h>
 #include <ccan/tal/tal.h>
@@ -21,9 +22,6 @@ enum bitcoind_mode {
 };
 
 struct bitcoind {
-	/* What mode are we in. */
-	enum bitcoind_mode testmode;
-
 	/* -datadir arg for bitcoin-cli. */
 	char *datadir;
 
@@ -35,6 +33,9 @@ struct bitcoind {
 
 	/* Pending requests. */
 	struct list_head pending;
+
+	/* What network are we on? */
+	const struct chainparams *chainparams;
 };
 
 struct bitcoind *new_bitcoind(const tal_t *ctx, struct log *log);
diff --git a/daemon/lightningd.c b/daemon/lightningd.c
index a23e4913b..b187c8591 100644
--- a/daemon/lightningd.c
+++ b/daemon/lightningd.c
@@ -13,6 +13,7 @@
 #include "secrets.h"
 #include "timeout.h"
 #include "utils.h"
+#include <bitcoin/chainparams.h>
 #include <ccan/container_of/container_of.h>
 #include <ccan/err/err.h>
 #include <ccan/io/io.h>
@@ -82,6 +83,7 @@ int main(int argc, char *argv[])
 
 	dstate->topology = new_topology(dstate, dstate->base_log);
 	dstate->bitcoind = new_bitcoind(dstate, dstate->base_log);
+	dstate->bitcoind->chainparams = chainparams_for_network("regtest");
 
 	/* Handle options and config; move to .lightningd */
 	register_opts(dstate);
diff --git a/daemon/options.c b/daemon/options.c
index 8ee06d082..f9a2446e6 100644
--- a/daemon/options.c
+++ b/daemon/options.c
@@ -153,25 +153,18 @@ static void opt_show_u16(char buf[OPT_SHOW_LEN], const u16 *u)
 	snprintf(buf, OPT_SHOW_LEN, "%u", *u);
 }
 
-static char *opt_set_regtest(struct bitcoind *bitcoind)
-{
-	bitcoind->testmode = BITCOIND_REGTEST;
-	return NULL;
-}
-
 static char *opt_set_network(const char *arg, struct lightningd *ld)
 {
 	ld->chainparams = chainparams_for_network(arg);
 	if (!ld->chainparams)
 		return tal_fmt(NULL, "Unknown network name '%s'", arg);
+	ld->dstate.testnet = ld->chainparams->testnet;
+	ld->bitcoind->chainparams = ld->chainparams;
 	return NULL;
 }
 
 static void config_register_opts(struct lightningd_state *dstate)
 {
-	opt_register_noarg("--bitcoind-regtest", opt_set_regtest,
-			   dstate->bitcoind,
-			   "Bitcoind is in regtest mode");
 	opt_register_arg("--locktime-blocks", opt_set_u32, opt_show_u32,
 			 &dstate->config.locktime_blocks,
 			 "Blocks before peer can unilaterally spend funds");
diff --git a/daemon/test/scripts/helpers.sh b/daemon/test/scripts/helpers.sh
index 17dfc6b32..f4a6699a4 100644
--- a/daemon/test/scripts/helpers.sh
+++ b/daemon/test/scripts/helpers.sh
@@ -112,7 +112,6 @@ setup_lightning()
     cat > $DIR1/config <<EOF
 disable-irc
 log-level=debug
-bitcoind-regtest
 bitcoind-poll=5s
 deadline-blocks=5
 min-htlc-expiry=6
diff --git a/lightningd/lightningd.c b/lightningd/lightningd.c
index d7f023b1e..bba5bbf59 100644
--- a/lightningd/lightningd.c
+++ b/lightningd/lightningd.c
@@ -130,7 +130,7 @@ static struct lightningd *new_lightningd(const tal_t *ctx)
 	ld->dstate.announce = NULL;
 	ld->topology = ld->dstate.topology = new_topology(ld, ld->log);
 	ld->bitcoind = ld->dstate.bitcoind = new_bitcoind(ld, ld->log);
-	ld->bitcoind->testmode = ld->dstate.testnet?BITCOIND_TESTNET:BITCOIND_MAINNET;
+	ld->chainparams = chainparams_for_network("testnet");
 
 	/* FIXME: Move into invoice daemon. */
 	ld->dstate.invoices = invoices_init(&ld->dstate);
diff --git a/tests/utils.py b/tests/utils.py
index 8d04853cf..b123c01c6 100644
--- a/tests/utils.py
+++ b/tests/utils.py
@@ -214,7 +214,6 @@ class LightningD(TailableProc):
             '--lightning-dir={}'.format(lightning_dir),
             '--port={}'.format(port),
             '--disable-irc',
-            '--bitcoind-regtest',
         ]
 
         self.cmd_line += ["--{}={}".format(k, v) for k, v in LIGHTNINGD_CONFIG.items()]