diff --git a/ckan/logic/converters.py b/ckan/logic/converters.py
index 8801387da2a..066520cc1e8 100644
--- a/ckan/logic/converters.py
+++ b/ckan/logic/converters.py
@@ -77,11 +77,11 @@ def callable(key, data, errors, context):
         if not v:
             raise Invalid(_('Tag vocabulary "%s" does not exist') % vocab)
 
-        tags = {}
+        tags = []
         for k in data.keys():
             if k[0] == 'tags':
                 if data[k].get('vocabulary_id') == v.id:
-                    tags[k] = data[k]
-        data[key] = ', '.join([t['name'] for t in tags.values()])
+                    tags.append(data[k]['name'])
+        data[key] = tags
     return callable