diff --git a/app/view_objects/articles/social_image.rb b/app/view_objects/articles/social_image.rb
index 6ea3a5710..57e8584ca 100644
--- a/app/view_objects/articles/social_image.rb
+++ b/app/view_objects/articles/social_image.rb
@@ -32,9 +32,9 @@ module Articles
     attr_reader :article
 
     def legacy_article_social_image
-      cache_key = "article-social-img-#{article}-#{article.updated_at}-#{article.comments_count}"
+      cache_key = "article-social-img-#{article}-#{article.updated_at.rfc3339}-#{article.comments_count}"
 
-      Rails.cache.fetch(cache_key, expires_in: 1.hour) do
+      RedisRailsCache.fetch(cache_key, expires_in: 1.hour) do
         src = GeneratedImage.new(article).social_image
         return src if src.start_with? "https://res.cloudinary.com/"