diff --git a/Capy64/Runtime/Libraries/MachineLib.cs b/Capy64/Runtime/Libraries/MachineLib.cs
index 7b08d6f..3eb55d5 100644
--- a/Capy64/Runtime/Libraries/MachineLib.cs
+++ b/Capy64/Runtime/Libraries/MachineLib.cs
@@ -189,20 +189,13 @@ public class MachineLib : IComponent
     {
         var L = Lua.FromIntPtr(state);
 
-        var lMotor = (float)L.CheckNumber(1);
-        var rMotor = (float)L.OptNumber(2, lMotor);
+        var left = (float)L.CheckNumber(1);
+        var right = (float)L.OptNumber(2, left);
 
-        var lTrigger = (float)L.OptNumber(3, 0);
-        var rTrigger = (float)L.OptNumber(4, lTrigger);
-        
+        left = Math.Clamp(left, 0, 1);
+        right = Math.Clamp(right, 0, 1);
 
-        lMotor = Math.Clamp(lMotor, 0, 1);
-        rMotor = Math.Clamp(rMotor, 0, 1);
-
-        lTrigger = Math.Clamp(lTrigger, 0, 1);
-        rTrigger = Math.Clamp(rTrigger, 0, 1);
-
-        GamePad.SetVibration(PlayerIndex.One, lMotor, rMotor, lTrigger, rTrigger);
+        GamePad.SetVibration(PlayerIndex.One, left, right);
 
         return 0;
     }