diff --git a/muk_fields_lobject/fields/lobject.py b/muk_fields_lobject/fields/lobject.py
index 7695570..b00524f 100644
--- a/muk_fields_lobject/fields/lobject.py
+++ b/muk_fields_lobject/fields/lobject.py
@@ -37,7 +37,7 @@ class LargeObject(fields.Field):
         'context_dependent': True,      
     }
     
-    def convert_to_column(self, value, record, values=None):
+    def convert_to_column(self, value, record, values=None, validate=True):
         oid = record.with_context({'oid': True})[self.name]
         if oid:
             record.env.cr._cnx.lobject(oid, 'rb').unlink()