--- a/src/test/perl/PostgresNode.pm
+++ b/src/test/perl/PostgresNode.pm
@@ -447,10 +447,13 @@ sub init
 	print $conf "log_statement = all\n";
 	print $conf "log_replication_commands = on\n";
 	print $conf "wal_retrieve_retry_interval = '500ms'\n";
 	print $conf "port = $port\n";
 
+	print $conf TestLib::slurp_file($ENV{TEMP_CONFIG})
+	  if defined $ENV{TEMP_CONFIG};
+
 	if ($params{allows_streaming})
 	{
 		if ($params{allows_streaming} eq "logical")
 		{
 			print $conf "wal_level = logical\n";