diff --git a/app/controllers/api/api_controller.rb b/app/controllers/api/api_controller.rb
index e313dce..8413520 100644
--- a/app/controllers/api/api_controller.rb
+++ b/app/controllers/api/api_controller.rb
@@ -102,7 +102,7 @@ def pept2taxa
     response_data["result"].each do |item|
       taxon_objs = []
       for taxon_id in item["taxa"]
-        unless taxon_id_to_obj.key? taxon_id
+        if taxon_id_to_obj.key? taxon_id
           taxon_objs.append(taxon_id_to_obj[taxon_information])
         end
       end