diff --git a/gmod/src/lua/lua_state.rs b/gmod/src/lua/lua_state.rs
index bc08af0..ff42307 100644
--- a/gmod/src/lua/lua_state.rs
+++ b/gmod/src/lua/lua_state.rs
@@ -7,7 +7,6 @@ use crate::lua::*;
 pub struct LuaState(pub *mut std::ffi::c_void);
 unsafe impl Send for LuaState {}
 impl LuaState {
-
 	/// Returns the Lua string as a slice of bytes.
 	///
 	/// **WARNING:** This will CHANGE the type of the value at the given index to a string.
@@ -272,8 +271,8 @@ impl LuaState {
 	}
 
 	#[inline]
-	pub unsafe fn check_userdata(&self, arg: i32, name: LuaString) -> *mut c_void {
-		(LUA_SHARED.lual_checkudata)(*self, arg, name)
+	pub unsafe fn check_userdata(&self, arg: i32, name: LuaString) -> *mut UserData {
+		(LUA_SHARED.lual_checkudata)(*self, arg, name) as *mut _
 	}
 
 	pub unsafe fn test_userdata(&self, index: i32, name: LuaString) -> bool {
diff --git a/gmod/src/lua/mod.rs b/gmod/src/lua/mod.rs
index 66c898e..95dfa2d 100644
--- a/gmod/src/lua/mod.rs
+++ b/gmod/src/lua/mod.rs
@@ -6,6 +6,14 @@ pub use import::*;
 mod lua_state;
 pub use lua_state::LuaState as State;
 
+#[repr(C)]
+#[derive(Debug)]
+pub struct UserData
+{
+	data: *mut core::ffi::c_void,
+	r#type: u8
+}
+
 #[derive(Debug, Clone)]
 pub enum LuaError {
 	/// Out of memory