diff --git a/.gitmodules b/.gitmodules
index dba9b4a..2ea0cb6 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,3 +1,6 @@
 [submodule "internal/luau"]
 	path = internal/luau
 	url = https://github.com/luau-lang/luau
+[submodule "ffi/luau"]
+	path = ffi/luau
+	url = https://github.com/luau-lang/luau.git
diff --git a/ffi/lauxlib.go b/ffi/lauxlib.go
index 3696797..4b8002c 100644
--- a/ffi/lauxlib.go
+++ b/ffi/lauxlib.go
@@ -1,4 +1,4 @@
-package internal
+package ffi
 
 /*
 #cgo CFLAGS: -Iluau/VM/include -I/usr/lib/gcc/x86_64-pc-linux-gnu/14.1.1/include
diff --git a/ffi/lua.go b/ffi/lua.go
index 7461199..d5a8ba0 100644
--- a/ffi/lua.go
+++ b/ffi/lua.go
@@ -1,4 +1,4 @@
-package internal
+package ffi
 
 /*
 #cgo CFLAGS: -Iluau/VM/include -I/usr/lib/gcc/x86_64-pc-linux-gnu/14.1.1/include
@@ -697,7 +697,7 @@ func GetUserdataDtor(L *LuaState, tag int32) LuaDestructor {
 }
 
 func SetUserdataMetatable(L *LuaState, tag int32, idx int32) {
-	C.lua_setuserdatametatable(L, C.int(tag), C.int(idx))
+	C.lua_setuserdatametatable(L, C.int(idx))
 }
 
 func GetUserdataMetatable(L *LuaState, tag int32) {
diff --git a/ffi/luau b/ffi/luau
new file mode 160000
index 0000000..c517432
--- /dev/null
+++ b/ffi/luau
@@ -0,0 +1 @@
+Subproject commit c51743268bcbe5c5af1bd78bcacaefe7f6fe3391
diff --git a/ffi/util.go b/ffi/util.go
index 6af0e99..76216dd 100644
--- a/ffi/util.go
+++ b/ffi/util.go
@@ -1,4 +1,4 @@
-package internal
+package ffi
 
 //#include <stdlib.h>
 import "C"
diff --git a/ffi/vector3.go b/ffi/vector3.go
index 6753de6..b5b918e 100644
--- a/ffi/vector3.go
+++ b/ffi/vector3.go
@@ -1,6 +1,6 @@
 //go:build !LUAU_VECTOR4
 
-package internal
+package ffi
 
 /*
 #cgo CFLAGS: -Iluau/VM/include -I/usr/lib/gcc/x86_64-pc-linux-gnu/14.1.1/include