diff --git a/src/AddIns/DisplayBindings/AvalonEdit.AddIn/Src/ChangeMarkerMargin.cs b/src/AddIns/DisplayBindings/AvalonEdit.AddIn/Src/ChangeMarkerMargin.cs
index 51b5de4694..5ddc978bff 100644
--- a/src/AddIns/DisplayBindings/AvalonEdit.AddIn/Src/ChangeMarkerMargin.cs
+++ b/src/AddIns/DisplayBindings/AvalonEdit.AddIn/Src/ChangeMarkerMargin.cs
@@ -38,6 +38,7 @@ namespace ICSharpCode.AvalonEdit.AddIn
 		{
 			if (!disposed) {
 				changeWatcher.ChangeOccurred -= ChangeOccurred;
+				changeWatcher.Dispose();
 				disposed = true;
 			}
 		}