diff --git a/app/controllers/api/api_controller.rb b/app/controllers/api/api_controller.rb
index 8947fe2..4d7fe4c 100644
--- a/app/controllers/api/api_controller.rb
+++ b/app/controllers/api/api_controller.rb
@@ -101,7 +101,7 @@ def pept2taxa
 
     response_data["result"].each do |item|
       taxon_objs = []
-      for taxon_id in item.taxa
+      for taxon_id in item["taxa"]
         unless taxon_information.key? taxon_id
           taxon_objs.append(taxon_id_to_obj[taxon_information])
         end