diff --git a/app/controllers/personal_conferences_controller.rb b/app/controllers/personal_conferences_controller.rb
index 4e92345..23b56cc 100644
--- a/app/controllers/personal_conferences_controller.rb
+++ b/app/controllers/personal_conferences_controller.rb
@@ -174,7 +174,7 @@ class PersonalConferencesController < ApplicationController
       "isi_number" ,
       "language" 
     ]
-    @fields_to_show = @fields_to_show.map{|fs| fs!="period" ? [t(personal_conference."#{fs}"), fs] : [t("#{fs}"), fs]}
+    @fields_to_show = @fields_to_show.map{|fs| (fs!="period" ? [t(personal_conference."#{fs}"), fs] : [t("#{fs}"), fs])}
     @default_fields_to_show = [
       "authors",
       "paper_title",