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--- a/ForgeTracker/forgetracker/tracker_main.py
+++ b/ForgeTracker/forgetracker/tracker_main.py
@@ -873,9 +873,9 @@
             if cf.type == 'number' and value == '':
                 value = None
             if value is not None:
-                changes['custom_field_%s'%cf.name] =self.ticket.custom_fields.get(cf.name)
+                changes[cf.name[1:]] =self.ticket.custom_fields.get(cf.name)
                 self.ticket.custom_fields[cf.name] = value
-                changes['custom_field_%s'%cf.name] =self.ticket.custom_fields.get(cf.name)
+                changes[cf.name[1:]] =self.ticket.custom_fields.get(cf.name)
         thread = self.ticket.discussion_thread
         latest_post = thread.posts and thread.posts[-1] or None
         post = None