diff --git a/Windows/CS/Framework4.0/Toprie/Toprie/Camera.cs b/Windows/CS/Framework4.0/Toprie/Toprie/Camera.cs
index 8130c97..472fffd 100644
--- a/Windows/CS/Framework4.0/Toprie/Toprie/Camera.cs
+++ b/Windows/CS/Framework4.0/Toprie/Toprie/Camera.cs
@@ -8,6 +8,7 @@ using System.Linq;
 using System.Text;
 using System.Windows.Forms;
 using System.Threading;
+using System.Threading.Tasks;
 
 namespace JoyD.Windows.CS.Toprie
 {