--- packet-h245.old.c	2004-02-13 13:33:46.183399600 +0100
+++ packet-h245.c	2004-02-13 13:42:56.767059200 +0100
@@ -7598,7 +7598,7 @@
 
 	h221NonStandard = ((t35CountryCode * 256) + t35Extension) * 65536 + manufacturerCode;
 
-	proto_tree_add_uint(tree, hf_h245_h221Manufacturer, tvb, (offset-3)>>3,4,h221NonStandard);
+	proto_tree_add_uint(tree, hf_h245_h221Manufacturer, tvb, (offset>>3)-4 ,4,h221NonStandard);
 
 	return offset;
 }