diff --git a/sys/modules/opus/json.lua b/sys/modules/opus/json.lua
index 04b1cd1..41d0e36 100644
--- a/sys/modules/opus/json.lua
+++ b/sys/modules/opus/json.lua
@@ -39,7 +39,8 @@ if register_global_module_table then
 	_G[global_module_name] = json
 end
 
-local _ENV = nil -- blocking globals in Lua 5.2
+-- this was incompatible because we use fs later
+--local _ENV = nil -- blocking globals in Lua 5.2
 
 pcall (function()
 	-- Enable access to blocked metatables.