diff --git a/modules/redmine/browser.py b/modules/redmine/browser.py
index db07b2a8..316cbf8b 100644
--- a/modules/redmine/browser.py
+++ b/modules/redmine/browser.py
@@ -203,7 +203,7 @@ class RedmineBrowser(BaseBrowser):
                 fields[key] = div.attrib['value']
             else:
                 olist = div.xpath('.//option[@selected="selected"]')
-                fields[key] = ', '.join({i.attrib['value'] for i in olist})
+                fields[key] = ', '.join([i.attrib['value'] for i in olist])
 
         return fields
 
diff --git a/modules/redmine/pages/issues.py b/modules/redmine/pages/issues.py
index 50315677..8b62712b 100644
--- a/modules/redmine/pages/issues.py
+++ b/modules/redmine/pages/issues.py
@@ -430,7 +430,7 @@ class IssuePage(NewIssuePage):
             else:
                 # XXX: use _parse_selection()?
                 olist = div.xpath('.//option[@selected="selected"]')
-                value = ', '.join({i.attrib['value'] for i in olist})
+                value = ', '.join([i.attrib['value'] for i in olist])
             params['fields'][key] = value
 
         params['attachments'] = []