diff --git a/ckan/logic/schema.py b/ckan/logic/schema.py
index dfeb2a0b7f0..d98debe9690 100644
--- a/ckan/logic/schema.py
+++ b/ckan/logic/schema.py
@@ -116,6 +116,7 @@ def default_create_tag_schema():
 
 def default_create_package_schema():
     schema = {
+        '__before': [duplicate_extras_key, ignore],
         'id': [empty],
         'revision_id': [ignore],
         'name': [not_empty, unicode, name_validator, package_name_validator],
@@ -139,7 +140,6 @@ def default_create_package_schema():
         'tags': default_tags_schema(),
         'tag_string': [ignore_missing, tag_string_convert],
         'extras': default_extras_schema(),
-        'extras_validation': [duplicate_extras_key, ignore],
         'save': [ignore],
         'return_to': [ignore],
         'relationships_as_object': default_relationship_schema(),
diff --git a/ckan/logic/validators.py b/ckan/logic/validators.py
index 4b448168670..42a630405fd 100644
--- a/ckan/logic/validators.py
+++ b/ckan/logic/validators.py
@@ -313,7 +313,7 @@ def duplicate_extras_key(key, data, errors, context):
     for extra_key in set(extras_keys):
         extras_keys.remove(extra_key)
     if extras_keys:
-        errors[key].append(_('Duplicate key "%s"') % extras_keys[0])
+        errors['extras_validation'].append(_('Duplicate key "%s"') % extras_keys[0])
 
 def group_name_validator(key, data, errors, context):
     model = context['model']