diff --git a/ckan/logic/action/create.py b/ckan/logic/action/create.py
index 01b8d209865..91d907a0b24 100644
--- a/ckan/logic/action/create.py
+++ b/ckan/logic/action/create.py
@@ -1158,7 +1158,7 @@ def _group_or_org_member_create(context, data_dict, is_org=False):
     logic.get_action('member_create')(member_create_context, member_dict)
 
 def group_member_create(context, data_dict):
-    return _group_or_org_member_create(context, data_dict, is_org=True)
+    return _group_or_org_member_create(context, data_dict)
 
 def organization_member_create(context, data_dict):
     return _group_or_org_member_create(context, data_dict, is_org=True)