diff --git a/Paint/MainWindow.xaml.cs b/Paint/MainWindow.xaml.cs
index de1f9d0..030da44 100644
--- a/Paint/MainWindow.xaml.cs
+++ b/Paint/MainWindow.xaml.cs
@@ -12,6 +12,7 @@
 using System.Windows.Media.Imaging;
 using System.Windows.Navigation;
 using System.Windows.Shapes;
+using Paint.PaintUtils;
 
 namespace Paint
 {