diff --git a/lightning/src/ln/channelmanager.rs b/lightning/src/ln/channelmanager.rs
index 69bcf34b994..89a862b8371 100644
--- a/lightning/src/ln/channelmanager.rs
+++ b/lightning/src/ln/channelmanager.rs
@@ -6236,25 +6236,27 @@ where
 
 		let funded_channel_id = chan.context.channel_id();
 
+		macro_rules! fail_chan { ($err: expr) => { {
+			// Note that at this point we've filled in the funding outpoint on our
+			// channel, but its actually in conflict with another channel. Thus, if
+			// we call `convert_chan_phase_err` immediately (thus calling
+			// `update_maps_on_chan_removal`), we'll remove the existing channel
+			// from `id_to_peer`. Thus, we must first unset the funding outpoint on
+			// the channel.
+			let err = ChannelError::Close($err.to_owned());
+			chan.unset_funding_info(msg.temporary_channel_id);
+			return Err(convert_chan_phase_err!(self, err, &mut ChannelPhase::Funded(chan), &funded_channel_id).1);
+		} } }
+
 		match peer_state.channel_by_id.entry(funded_channel_id) {
 			hash_map::Entry::Occupied(_) => {
-				let err = ChannelError::Close("Already had channel with the new channel_id".to_owned());
-				// Note that at this point we've filled in the funding outpoint on our
-				// channel, but its actually in conflict with another channel. Thus, if
-				// we call `convert_chan_phase_err` immediately (thus calling
-				// `update_maps_on_chan_removal`), we'll remove the existing channel
-				// from `id_to_peer`. Thus, we must first unset the funding outpoint on
-				// the channel.
-				chan.unset_funding_info(msg.temporary_channel_id);
-				return Err(convert_chan_phase_err!(self, err, &mut ChannelPhase::Funded(chan), &funded_channel_id).1);
+				fail_chan!(err);
 			},
 			hash_map::Entry::Vacant(e) => {
 				let mut outpoint_to_peer_lock = self.outpoint_to_peer.lock().unwrap();
 				match outpoint_to_peer_lock.entry(monitor.get_funding_txo().0) {
 					hash_map::Entry::Occupied(_) => {
-						return Err(MsgHandleErrInternal::send_err_msg_no_close(
-							"The funding_created message had the same funding_txid as an existing channel - funding is not possible".to_owned(),
-							chan.context.channel_id()))
+						fail_chan!("The funding_created message had the same funding_txid as an existing channel - funding is not possible");
 					},
 					hash_map::Entry::Vacant(i_e) => {
 						let monitor_res = self.chain_monitor.watch_channel(monitor.get_funding_txo().0, monitor);
@@ -6283,15 +6285,7 @@ where
 						} else {
 							let logger = WithChannelContext::from(&self.logger, &chan.context);
 							log_error!(logger, "Persisting initial ChannelMonitor failed, implying the funding outpoint was duplicated");
-							let err = ChannelError::Close("Duplicate funding outpoint".to_owned());
-							// Note that at this point we've filled in the funding outpoint on our
-							// channel, but its actually in conflict with another channel. Thus, if
-							// we call `convert_chan_phase_err` immediately (thus calling
-							// `update_maps_on_chan_removal`), we'll remove the existing channel
-							// from `id_to_peer`. Thus, we must first unset the funding outpoint on
-							// the channel.
-							chan.unset_funding_info(msg.temporary_channel_id);
-							return Err(convert_chan_phase_err!(self, err, &mut ChannelPhase::Funded(chan), &funded_channel_id).1);
+							fail_chan!("Duplicate funding outpoint");
 						}
 					}
 				}