diff -urNp -x '*.orig' postgresql-16.1.org/src/test/regress/pg_regress.c postgresql-16.1/src/test/regress/pg_regress.c
--- postgresql-16.1.org/src/test/regress/pg_regress.c	2023-11-06 23:04:27.000000000 +0100
+++ postgresql-16.1/src/test/regress/pg_regress.c	2023-12-13 21:08:28.129574600 +0100
@@ -2427,6 +2427,7 @@ regression_main(int argc, char *argv[],
 		 */
 		snprintf(buf, sizeof(buf),
 				 "\"%s%spostgres\" -D \"%s/data\" -F%s "
+				 "-c \"log_directory=log\" "
 				 "-c \"listen_addresses=%s\" -k \"%s\" "
 				 "> \"%s/log/postmaster.log\" 2>&1",
 				 bindir ? bindir : "",