diff --git a/src/test/regress/pg_regress.c b/src/test/regress/pg_regress.c
index 5d85dcc62f0..61c035a3983 100644
--- a/src/test/regress/pg_regress.c
+++ b/src/test/regress/pg_regress.c
@@ -1968,10 +1968,10 @@ create_database(const char *dbname)
 	 */
 	if (encoding)
 		psql_add_command(buf, "CREATE DATABASE \"%s\" TEMPLATE=template0 ENCODING='%s'%s", dbname, encoding,
-						 (nolocale) ? " LOCALE='C'" : "");
+						 (nolocale) ? " LOCALE='C' LOCALE_PROVIDER='builtin'" : "");
 	else
 		psql_add_command(buf, "CREATE DATABASE \"%s\" TEMPLATE=template0%s", dbname,
-						 (nolocale) ? " LOCALE='C'" : "");
+						 (nolocale) ? " LOCALE='C' LOCALE_PROVIDER='builtin'" : "");
 	psql_add_command(buf,
 					 "ALTER DATABASE \"%s\" SET lc_messages TO 'C';"
 					 "ALTER DATABASE \"%s\" SET lc_monetary TO 'C';"