diff --git a/app/controllers/datacite_dois_controller.rb b/app/controllers/datacite_dois_controller.rb
index b912f6abd..f61a89a4f 100644
--- a/app/controllers/datacite_dois_controller.rb
+++ b/app/controllers/datacite_dois_controller.rb
@@ -561,15 +561,14 @@ def update
         @doi.assign_attributes(safe_params.slice(:client_id))
       else
         authorize! :update, @doi
-        params = safe_params
-        if params[:schema_version].blank?
+        if safe_params[:schema_version].blank?
           @doi.assign_attributes(
-            params.except(:doi, :client_id).merge(
+            safe_params.except(:doi, :client_id).merge(
               schema_version: @doi[:schema_version] || LAST_SCHEMA_VERSION,
             ),
           )
         else
-          @doi.assign_attributes(params.except(:doi, :client_id))
+          @doi.assign_attributes(safe_params.except(:doi, :client_id))
         end
       end
     else