diff --git a/addons/marketing_campaign/marketing_campaign.py b/addons/marketing_campaign/marketing_campaign.py
index c1674f85cc3..d9b87e91347 100644
--- a/addons/marketing_campaign/marketing_campaign.py
+++ b/addons/marketing_campaign/marketing_campaign.py
@@ -203,6 +203,10 @@ Normal - the campaign runs normally and automatically sends all emails and repor
             return record
         return None
 
+    # prevent duplication until the server properly duplicates several levels of nested o2m
+    def copy(self, cr, uid, id, default=None, context=None):
+        raise osv.except_osv("Operation not supported", "Sorry, campaign duplication is not supported at the moment.")
+
 marketing_campaign()
 
 class marketing_campaign_segment(osv.osv):