diff --git a/src/raylua_builder.lua b/src/raylua_builder.lua
index 8b0cc7b..673e53f 100644
--- a/src/raylua_builder.lua
+++ b/src/raylua_builder.lua
@@ -43,7 +43,6 @@
 local ffi = require "ffi"
 
 ffi.cdef "typedef struct FILE FILE;"
-local append_file_offset = ffi.cast("void (*)(FILE *, FILE *, FILE *)", append_file_offset)
 
 local self_path = arg[0]
 local input_path = arg[1]