diff --git a/tests/test_connection.py b/tests/test_connection.py
index c69b35bee..7b4f435f9 100644
--- a/tests/test_connection.py
+++ b/tests/test_connection.py
@@ -1891,7 +1891,10 @@ def test_multifunding_simple(node_factory, bitcoind):
                      "amount": 50000}]
 
     l1.rpc.multifundchannel(destinations)
-    bitcoind.generate_block(6, wait_for_mempool=1)
+    bitcoind.generate_block(1, wait_for_mempool=1)
+    # Don't have others reject channel_announcement as too far in future.
+    sync_blockheight(bitcoind, [l1, l2, l3, l4])
+    bitcoind.generate_block(5)
 
     for node in [l1, l2, l3, l4]:
         node.daemon.wait_for_log(r'to CHANNELD_NORMAL')
@@ -3471,6 +3474,8 @@ def test_wumbo_channels(node_factory, bitcoind):
     # Get that mined, and announced.
     bitcoind.generate_block(6, wait_for_mempool=1)
 
+    # Make sure l3 is ready to receive channel announcement!
+    sync_blockheight(bitcoind, [l1, l2, l3])
     # Connect l3, get gossip.
     l3.rpc.connect(l1.info['id'], 'localhost', port=l1.port)
 
diff --git a/tests/test_gossip.py b/tests/test_gossip.py
index beaba2267..552c118f5 100644
--- a/tests/test_gossip.py
+++ b/tests/test_gossip.py
@@ -1090,6 +1090,8 @@ def test_gossip_lease_rates(node_factory, bitcoind):
     l1.rpc.connect(l2.info['id'], 'localhost', l2.port)
     l1.fundchannel(l2, 10**6)
 
+    # Don't have l2 reject channel_announcement as too far in future.
+    sync_blockheight(bitcoind, [l1, l2])
     # Announce depth is ALWAYS 6 blocks
     bitcoind.generate_block(5)
 
diff --git a/tests/test_splicing.py b/tests/test_splicing.py
index 87a3cf499..019eaaf29 100644
--- a/tests/test_splicing.py
+++ b/tests/test_splicing.py
@@ -5,7 +5,7 @@ import pytest
 import unittest
 import time
 from utils import (
-    wait_for, TEST_NETWORK, first_scid, only_one
+    sync_blockheight, wait_for, TEST_NETWORK, first_scid, only_one
 )
 
 
@@ -313,7 +313,10 @@ def test_splice_stuck_htlc(node_factory, bitcoind, executor):
     assert len(list(mempool.keys())) == 1
     assert result['txid'] in list(mempool.keys())
 
-    bitcoind.generate_block(6, wait_for_mempool=1)
+    bitcoind.generate_block(1, wait_for_mempool=1)
+    # Don't have l2, l3 reject channel_announcement as too far in future.
+    sync_blockheight(bitcoind, [l1, l2, l3])
+    bitcoind.generate_block(5)
 
     l2.daemon.wait_for_log(r'CHANNELD_AWAITING_SPLICE to CHANNELD_NORMAL')
     l1.daemon.wait_for_log(r'CHANNELD_AWAITING_SPLICE to CHANNELD_NORMAL')