diff --git a/ChangeLog b/ChangeLog
index 24a0a5db3..a29efc50f 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2007-01-09  Mike Kestner  <mkestner@novell.com>
+
+	* sample/GtkDemo/DemoPixbuf.cs : use Marshal.Copy properly
+	to avoid expose crashes. Revised from patch provided by
+	Fabian Sturm.  [#78262]
+
 2007-01-09  Mike Kestner  <mkestner@novell.com>
 
 	* sample/GtkDemo/DemoIconView.cs : use Gtk.Stock icons to avoid
diff --git a/sample/GtkDemo/DemoPixbuf.cs b/sample/GtkDemo/DemoPixbuf.cs
index eab0ec2f2..a1ae4a1b8 100644
--- a/sample/GtkDemo/DemoPixbuf.cs
+++ b/sample/GtkDemo/DemoPixbuf.cs
@@ -80,7 +80,8 @@ namespace GtkDemo
 
 			rowstride = frame.Rowstride;
 			pixels = new byte[(frame.Height - area.Y) * rowstride];
-			Marshal.Copy (frame.Pixels, pixels, rowstride * area.Y + area.X * 3, pixels.Length);
+			IntPtr src = (IntPtr)(frame.Pixels.ToInt64 () + rowstride * area.Y + area.X * 3);
+			Marshal.Copy (src, pixels, 0, pixels.Length);
 
 			widget.GdkWindow.DrawRgbImageDithalign (widget.Style.BlackGC,
 								area.X, area.Y, area.Width, area.Height,