diff --git a/app/models/ad_image.rb b/app/models/ad_image.rb
index da233b1..18141be 100644
--- a/app/models/ad_image.rb
+++ b/app/models/ad_image.rb
@@ -47,7 +47,7 @@ class AdImage
 
   def youtube_thumb
     uri = URI.parse(self.youtube) rescue nil
-    if !uri.nil?
+    if !uri.nil? && uri.host == "www.youtube.com"
       params = CGI.parse(uri.query)
       v = params['v'].first
       return "http://img.youtube.com/vi/#{v}/0.jpg"