diff --git a/lib/topic_retriever.rb b/lib/topic_retriever.rb
index 16823773091..090ad6244ab 100644
--- a/lib/topic_retriever.rb
+++ b/lib/topic_retriever.rb
@@ -13,7 +13,7 @@ class TopicRetriever
   private
 
     def invalid_host?
-      SiteSetting.allows_embeddable_host?(@embed_url)
+      !SiteSetting.allows_embeddable_host?(@embed_url)
     end
 
     def retrieved_recently?