diff --git a/toxygen/wrapper/tox.py b/toxygen/wrapper/tox.py
index 9d955a4..b4c401c 100644
--- a/toxygen/wrapper/tox.py
+++ b/toxygen/wrapper/tox.py
@@ -1340,7 +1340,7 @@ class Tox:
         Size in bytes (c_size_t) of the filename.
         pointer (c_void_p) to user_data
         """
-        c_callback = CFUNCTYPE(None, c_void_p, c_uint32, c_uint32, c_uint32, c_uint64, c_char_p, c_size_t)
+        c_callback = CFUNCTYPE(None, c_void_p, c_uint32, c_uint32, c_uint32, c_uint64, c_char_p, c_size_t, c_void_p)
         self.file_recv_cb = c_callback(callback)
         self.libtoxcore.tox_callback_file_recv(self._tox_pointer, self.file_recv_cb)