diff --git a/mastoapi.lua b/mastoapi.lua
index 87e5582..ccbed24 100644
--- a/mastoapi.lua
+++ b/mastoapi.lua
@@ -3,7 +3,7 @@ local server_name = minetest.settings:get("server_name") or ""
 local automatic_delete = minetest.settings:get_bool("fediauth.automatic_delete")
 
 function fediauth.send_code(code, account_handle)
-	expires_in = nil
+	local expires_in = nil
 	if automatic_delete then
 		expires_in = 3600
 	end