diff --git a/ChangeLog b/ChangeLog
index 9e46ff6c1..78ac85b66 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2009-11-01  Mike Kestner  <mkestner@novell.com>
+
+	* glib/Value.cs: avoid cast exceptions passing ints as objects on
+	  gulong values.  [Fixes #539812]
+
 2009-10-30  Mike Kestner  <mkestner@novell.com>
 
 	* glib/GType.cs: avoid another exception on bogus assm.Locations.
diff --git a/glib/Value.cs b/glib/Value.cs
index 81e67ad38..d7e5d75a6 100755
--- a/glib/Value.cs
+++ b/glib/Value.cs
@@ -552,7 +552,7 @@ namespace GLib {
 				else if (type == GType.UInt64.Val)
 					g_value_set_uint64 (ref this, (ulong) value);
 				else if (type == GType.ULong.Val)
-					SetULongForPlatform ((ulong) value);
+					SetULongForPlatform (Convert.ToUInt64 (value));
 				else if (GType.Is (type, GType.Enum))
 					g_value_set_enum (ref this, (int)value);
 				else if (GType.Is (type, GType.Flags))