diff --git a/ChangeLog b/ChangeLog
index 93480dc04..4b02d1c08 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2009-01-04  Mike Kestner  <mkestner@novell.com>
+
+	* glib/GType.cs: fix incorrect null check noticed by Christian Hoff.
+	[Fixes #463445]
+
 2009-01-02  Mike Kestner  <mkestner@novell.com>
 
 	* configure.in.in: clarify the Mono.Cairo summary comment.
diff --git a/glib/GType.cs b/glib/GType.cs
index 4455a8e00..dcc76fed0 100755
--- a/glib/GType.cs
+++ b/glib/GType.cs
@@ -258,7 +258,7 @@ namespace GLib {
 		internal IntPtr ClassPtr {
 			get {
 				IntPtr klass = g_type_class_peek (val);
-				if (val == IntPtr.Zero)
+				if (klass == IntPtr.Zero)
 					klass = g_type_class_ref (val);
 				return klass;
 			}