diff --git a/app/models/metadata_content.rb b/app/models/metadata_content.rb
index 437a0dd..9d3a104 100644
--- a/app/models/metadata_content.rb
+++ b/app/models/metadata_content.rb
@@ -56,7 +56,7 @@ class MetadataContent < MetadataTemplate
         uri = URI element['src']
 
         # No permitimos recursos externos
-        element.remove unless uri.hostname.end_with? Site.domain
+        element.remove unless uri.scheme == 'https' && uri.hostname.end_with?(Site.domain)
       rescue URI::Error
         element.remove
       end