diff --git a/daemon/chaintopology.c b/daemon/chaintopology.c
index 62a8cf08b..a4596b820 100644
--- a/daemon/chaintopology.c
+++ b/daemon/chaintopology.c
@@ -67,7 +67,7 @@ static void start_poll_chaintips(struct lightningd_state *dstate);
 
 static void next_topology_timer(struct lightningd_state *dstate)
 {
-	new_reltimer(dstate, dstate, time_from_sec(dstate->config.poll_seconds),
+	new_reltimer(dstate, dstate, dstate->config.poll_time,
 		     start_poll_chaintips, dstate);
 }
 
diff --git a/daemon/lightningd.c b/daemon/lightningd.c
index 28afb8b33..63b9375ed 100644
--- a/daemon/lightningd.c
+++ b/daemon/lightningd.c
@@ -5,6 +5,7 @@
 #include "jsonrpc.h"
 #include "lightningd.h"
 #include "log.h"
+#include "opt_time.h"
 #include "peer.h"
 #include "secrets.h"
 #include "timeout.h"
@@ -14,6 +15,7 @@
 #include <ccan/opt/opt.h>
 #include <ccan/tal/str/str.h>
 #include <ccan/tal/tal.h>
+#include <ccan/time/time.h>
 #include <ccan/timer/timer.h>
 #include <errno.h>
 #include <inttypes.h>
@@ -98,9 +100,9 @@ static void config_register_opts(struct lightningd_state *dstate)
 	opt_register_arg("--max-expiry", opt_set_u32, opt_show_u32,
 			 &dstate->config.max_expiry,
 			 "Maximum number of seconds to accept an HTLC before expiry");
-	opt_register_arg("--bitcoind-poll", opt_set_u32, opt_show_u32,
-			 &dstate->config.poll_seconds,
-			 "Seconds between polling for new transactions");
+	opt_register_arg("--bitcoind-poll", opt_set_time, opt_show_time,
+			 &dstate->config.poll_time,
+			 "Time between polling for new transactions");
 }
 
 #define MINUTES 60
@@ -151,7 +153,7 @@ static void default_config(struct config *config)
 	/* Don't lock up channel for more than 5 days. */
 	config->max_expiry = 5 * DAYS;
 
-	config->poll_seconds = 30;
+	config->poll_time = time_from_sec(30);
 }
 
 static void check_config(struct lightningd_state *dstate)
diff --git a/daemon/lightningd.h b/daemon/lightningd.h
index c3bc201bf..2799407c6 100644
--- a/daemon/lightningd.h
+++ b/daemon/lightningd.h
@@ -41,8 +41,8 @@ struct config {
 	/* Minimum/maximum time for an expiring HTLC (seconds). */
 	u32 min_expiry, max_expiry;
 	
-	/* How long (seconds) between polling bitcoind. */
-	u32 poll_seconds;
+	/* How long between polling bitcoind. */
+	struct timerel poll_time;
 };
 
 /* Here's where the global variables hide! */
diff --git a/daemon/test/test.sh b/daemon/test/test.sh
index a7b49773d..69bbb2652 100755
--- a/daemon/test/test.sh
+++ b/daemon/test/test.sh
@@ -211,7 +211,7 @@ mkdir $DIR1 $DIR2
 
 cat > $DIR1/config <<EOF
 log-level=debug
-bitcoind-poll=1
+bitcoind-poll=1s
 min-expiry=900
 bitcoin-datadir=$DATADIR
 locktime=600
@@ -219,7 +219,7 @@ EOF
 
 cat > $DIR2/config <<EOF
 log-level=debug
-bitcoind-poll=1
+bitcoind-poll=1s
 min-expiry=900
 bitcoin-datadir=$DATADIR
 locktime=600