diff --git a/fuzz/src/chanmon_consistency.rs b/fuzz/src/chanmon_consistency.rs
index e923ef882f2..f3546f21cf2 100644
--- a/fuzz/src/chanmon_consistency.rs
+++ b/fuzz/src/chanmon_consistency.rs
@@ -166,6 +166,10 @@ impl chain::Watch<EnforcingSigner> for TestChainMonitor {
 	fn release_pending_monitor_events(&self) -> Vec<(OutPoint, Vec<MonitorEvent>, Option<PublicKey>)> {
 		return self.chain_monitor.release_pending_monitor_events();
 	}
+
+	fn update_channel_funding_txo(&self, old_funding_txo: OutPoint, new_funding_txo: OutPoint, channel_value_satoshis: u64) -> ChannelMonitorUpdateStatus {
+		todo!()
+	}
 }
 
 struct KeyProvider {
@@ -306,6 +310,7 @@ fn check_api_err(api_err: APIError, sendable_bounds_violated: bool) {
 			// We can (obviously) temp-fail a monitor update
 		},
 		APIError::IncompatibleShutdownScript { .. } => panic!("Cannot send an incompatible shutdown script"),
+		APIError::ExternalError { .. } => panic!("We don't produce external errors in fuzz!"),
 	}
 }
 #[inline]
diff --git a/fuzz/src/router.rs b/fuzz/src/router.rs
index 31732257c3f..454ed854641 100644
--- a/fuzz/src/router.rs
+++ b/fuzz/src/router.rs
@@ -271,6 +271,11 @@ pub fn do_test<Out: test_logger::Output>(data: &[u8], out: Out) {
 								config: None,
 								feerate_sat_per_1000_weight: None,
 								channel_shutdown_state: Some(channelmanager::ChannelShutdownState::NotShuttingDown),
+								funding_redeemscript: None,
+								holder_funding_pubkey: get_pubkey!(),
+								counter_funding_pubkey: None,
+								original_funding_outpoint: None,
+								channel_keys_id: [0u8; 32],
 							});
 						}
 						Some(&first_hops_vec[..])