diff --git a/tests/test_bookkeeper.py b/tests/test_bookkeeper.py
index be2a01a6d..a3931ba55 100644
--- a/tests/test_bookkeeper.py
+++ b/tests/test_bookkeeper.py
@@ -46,7 +46,7 @@ def test_bookkeeping_closing_trimmed_htlcs(node_factory, bitcoind, executor):
     bitcoind.generate_block(5)
     sync_blockheight(bitcoind, [l1])
     l1.daemon.wait_for_log('Broadcasting OUR_DELAYED_RETURN_TO_WALLET')
-    bitcoind.generate_block(20)
+    bitcoind.generate_block(20, wait_for_mempool=1)
     sync_blockheight(bitcoind, [l1])
     l1.daemon.wait_for_log(r'All outputs resolved.*')