diff --git a/postgresql.custom.conf b/postgresql.custom.conf
index 07a530c..9d3e5ff 100644
--- a/postgresql.custom.conf
+++ b/postgresql.custom.conf
@@ -16,7 +16,7 @@ work_mem = 128MB
 wal_buffers = 1024kB
 wal_writer_delay = 500ms
 commit_delay = 10000
-checkpoint_segments = 60
+# checkpoint_segments = 60 # unrecognized in psql 10.7.1
 max_wal_size = 2880MB
 random_page_cost = 1.1
 track_activity_query_size = 16384