diff --git a/product/ERP5/mixin/cached_convertable.py b/product/ERP5/mixin/cached_convertable.py
index 2aeb28248e9df946e57bd5df4f909668c7de36dc..d3e59b13baac036f23b0d9d6897dd074986365e7 100644
--- a/product/ERP5/mixin/cached_convertable.py
+++ b/product/ERP5/mixin/cached_convertable.py
@@ -67,10 +67,6 @@ class CachedConvertableMixin:
     Format can be a string or a tuple (e.g. format, resolution).
   """
 
-  # Declarative security
-  security = ClassSecurityInfo()
-
-
   # Declarative security
   security = ClassSecurityInfo()
   security.declareObjectProtected(Permissions.AccessContentsInformation)