diff --git a/app/forms/hyrax/pdf_form_behavior.rb b/app/forms/hyrax/pdf_form_behavior.rb
index 1ed049e1..eba669ae 100644
--- a/app/forms/hyrax/pdf_form_behavior.rb
+++ b/app/forms/hyrax/pdf_form_behavior.rb
@@ -9,13 +9,18 @@ module PdfFormBehavior
 
       self.terms += %i[show_pdf_viewer show_pdf_download_button]
       self.hidden_terms = %i[show_pdf_viewer show_pdf_download_button]
-      # Not sure why this is needed but the form was not working without it
-      # it was getting a Unpermitted parameter error for these terms
-      permitted_params << %i[show_pdf_viewer show_pdf_download_button]
     end
 
     def hidden?(key)
       hidden_terms.include? key.to_sym
     end
+
+    class_methods do
+      # Not sure why this is needed but the form was no working without it
+      # it was getting an Unpermitted paratemter error for these terms
+      def permitted_params
+        super + %i[show_pdf_viewer show_pdf_download_button]
+      end
+    end
   end
 end