diff --git a/lib/mrkt/concerns/crud_campaigns.rb b/lib/mrkt/concerns/crud_campaigns.rb
index c81af94..22f881a 100644
--- a/lib/mrkt/concerns/crud_campaigns.rb
+++ b/lib/mrkt/concerns/crud_campaigns.rb
@@ -1,6 +1,6 @@
 module Mrkt
   module CrudCampaigns
-    def request_campaign(id, lead_ids, tokens = {})
+    def request_campaign(id, lead_ids, tokens = [])
       post_json("/rest/v1/campaigns/#{id}/trigger.json") do
         {
           input: {