diff --git a/config/application.rb b/config/application.rb
index 42ca666b01aa256c57a18f21684d2147d5fb0743..959a1b37c9dd48f10200d5d67e983c9b720b337b 100644
--- a/config/application.rb
+++ b/config/application.rb
@@ -67,7 +67,7 @@ module Osuny
       "sgid", "content-type", "url", "filename", "filesize", "previewable"
     ]
 
-    config.allowed_special_chars = '#?!,@$%^&*+:;£µ-'
+    config.allowed_special_chars = '#?!,_@$%^&*+:;£µ-'
 
     config.generators do |g|
       g.orm :active_record, primary_key_type: :uuid