1 files changed, 1 insertions, 1 deletions

diff --git a/src/luarocks/cfg.lua b/src/luarocks/cfg.lua
index a22cf121..e41b632c 100644
--- a/src/luarocks/cfg.lua
+++ b/src/luarocks/cfg.lua
@@ -149,7 +149,7 @@ local sys_config_file_default, home_config_file_default
 local sys_config_dir, home_config_dir
 local sys_config_ok, home_config_ok = false, false
 local extra_luarocks_module_dir
-sys_config_dir = site_config.LUAROCKS_SYSCONFDIR
+sys_config_dir = site_config.LUAROCKS_SYSCONFDIR or site_config.LUAROCKS_PREFIX
 if cfg.platforms.windows then
    cfg.home = os.getenv("APPDATA") or "c:"
    sys_config_dir = sys_config_dir or "c:/luarocks"