diff --git a/scripts/1-rft.lua b/scripts/1-rft.lua
index e8836b2..8ca8bd3 100644
--- a/scripts/1-rft.lua
+++ b/scripts/1-rft.lua
@@ -44,7 +44,7 @@ local function start_rft()
     end
 end
 
-function load_rft_file()
+local function load_rft_file()
     local file = io.open("/tmp/rft_test", "rb")
     if not file then error("Could not open file") end
     _Rft_file = file:read("*a")