diff --git a/technic_cnc/pipeworks.lua b/technic_cnc/pipeworks.lua
index 2fd4931e..18ba0e2e 100644
--- a/technic_cnc/pipeworks.lua
+++ b/technic_cnc/pipeworks.lua
@@ -42,7 +42,7 @@ end
 local function on_receive_fields(pos, meta, fields, sender, update_formspec)
 	-- https://github.com/mt-mods/pipeworks/-/blob/master/common.lua#L115
 	for field,_ in pairs(fields) do
-		if string.sub(field, 1, 19) == "fs_helpers_cycling:" then
+		if field:match("^fs_helpers_cycling:") then
 			if pipeworks.may_configure(pos, sender) then
 				pipeworks_on_receive_fields(pos, fields)
 				update_formspec(meta)