Index: trac/ticket/api.py
===================================================================
--- trac/ticket/api.py  (revision 2678)
+++ trac/ticket/api.py  (working copy)
@@ -18,6 +18,7 @@
 from trac.core import *
 from trac.perm import IPermissionRequestor
 from trac.wiki import IWikiSyntaxProvider
+from trac.wiki import wiki_to_oneliner
 from trac.Search import ISearchSource, query_to_sql, shorten_result


@@ -108,7 +109,7 @@
                 'name': name,
                 'type': self.config.get('ticket-custom', name),
                 'order': int(self.config.get('ticket-custom', name + '.order', '0')),
-                'label': self.config.get('ticket-custom', name + '.label', ''),
+                'label': wiki_to_oneliner(self.config.get('ticket-custom', name + '.label', ''), self.env, self.env.get_db_cnx()),
                 'value': self.config.get('ticket-custom', name + '.value', '')
             }
             if field['type'] == 'select' or field['type'] == 'radio':