diff --git a/src/m64py/core/defs.py b/src/m64py/core/defs.py
index 4b63139..f7f34d2 100644
--- a/src/m64py/core/defs.py
+++ b/src/m64py/core/defs.py
@@ -190,7 +190,10 @@ class m64p_rom_settings(C.Structure):
         ('savetype', C.c_ubyte),
         ('status', C.c_ubyte),
         ('players', C.c_ubyte),
-        ('rumble', C.c_ubyte)
+        ('rumble', C.c_ubyte),
+        ('transferpak', C.c_ubyte),
+        ('mempak', C.c_ubyte),
+        ('biopak', C.c_ubyte)
     ]