Type mismatch in vehicle sample code

Source/Samples/19_VehicleDemo/Vehicle.cpp

@@ -51,10 +51,10 @@ void Vehicle::RegisterObject(Context* context)
     URHO3D_ATTRIBUTE("Steering", float, steering_, 0.0f, AM_DEFAULT);
     // Register wheel node IDs as attributes so that the wheel nodes can be reaquired on deserialization. They need to be tagged
     // as node ID's so that the deserialization code knows to rewrite the IDs in case they are different on load than on save
-    URHO3D_ATTRIBUTE("Front Left Node", int, frontLeftID_, 0, AM_DEFAULT | AM_NODEID);
-    URHO3D_ATTRIBUTE("Front Right Node", int, frontRightID_, 0, AM_DEFAULT | AM_NODEID);
-    URHO3D_ATTRIBUTE("Rear Left Node", int, rearLeftID_, 0, AM_DEFAULT | AM_NODEID);
-    URHO3D_ATTRIBUTE("Rear Right Node", int, rearRightID_, 0, AM_DEFAULT | AM_NODEID);
+    URHO3D_ATTRIBUTE("Front Left Node", unsigned, frontLeftID_, 0, AM_DEFAULT | AM_NODEID);
+    URHO3D_ATTRIBUTE("Front Right Node", unsigned, frontRightID_, 0, AM_DEFAULT | AM_NODEID);
+    URHO3D_ATTRIBUTE("Rear Left Node", unsigned, rearLeftID_, 0, AM_DEFAULT | AM_NODEID);
+    URHO3D_ATTRIBUTE("Rear Right Node", unsigned, rearRightID_, 0, AM_DEFAULT | AM_NODEID);
 }
 
 void Vehicle::ApplyAttributes()