diff --git a/demo/splitter.py b/demo/splitter.py
index f40b67137..5c5da67a8 100644
--- a/demo/splitter.py
+++ b/demo/splitter.py
@@ -7,6 +7,7 @@
 # FOR A PARTICULAR PURPOSE.
 # ===========================================================================
 
+import clr
 import System.Windows.Forms as WinForms
 from System.Drawing import Color, Size, Point
 import System