diff --git a/backend/lib/tasks/migrate_wiki.rake b/backend/lib/tasks/migrate_wiki.rake
index 69217da..03a68f3 100644
--- a/backend/lib/tasks/migrate_wiki.rake
+++ b/backend/lib/tasks/migrate_wiki.rake
@@ -44,6 +44,7 @@ namespace :wiki do
         end
         line_ids = line_shas.map { |sha| line_id_by_sha.fetch(sha) }
 
+        rev = nil
         ActiveRecord::Base.transaction do
           wiki_page.lock!