diff --git a/src/test/perl/PostgreSQL/Test/Cluster.pm b/src/test/perl/PostgreSQL/Test/Cluster.pm
index 1c11750ac1d..49b2c86b29c 100644
--- a/src/test/perl/PostgreSQL/Test/Cluster.pm
+++ b/src/test/perl/PostgreSQL/Test/Cluster.pm
@@ -684,7 +684,7 @@ sub init
 	print $conf "\n# Added by PostgreSQL::Test::Cluster.pm\n";
 	print $conf "fsync = off\n";
 	print $conf "restart_after_crash = off\n";
-	print $conf "log_line_prefix = '%m [%p] %q%a '\n";
+	print $conf "log_line_prefix = '%m %b[%p] %q%a '\n";
 	print $conf "log_statement = all\n";
 	print $conf "log_replication_commands = on\n";
 	print $conf "wal_retrieve_retry_interval = '500ms'\n";
diff --git a/src/tools/ci/pg_ci_base.conf b/src/tools/ci/pg_ci_base.conf
index 9cec5c2910d..695e0a0d6ec 100644
--- a/src/tools/ci/pg_ci_base.conf
+++ b/src/tools/ci/pg_ci_base.conf
@@ -10,5 +10,5 @@ log_autovacuum_min_duration = 0
 log_checkpoints = true
 log_connections = all
 log_disconnections = true
-log_line_prefix = '%m [%p][%b] %q[%a][%v:%x] '
+log_line_prefix = '%m %b[%p] %q%a '
 log_lock_waits = true