diff --git a/openerp/fields.py b/openerp/fields.py
index dabf83f0923..d5d92e2c75d 100644
--- a/openerp/fields.py
+++ b/openerp/fields.py
@@ -958,7 +958,7 @@ class Field(object):
     def determine_draft_value(self, record):
         """ Determine the value of ``self`` for the given draft ``record``. """
         if self.compute:
-            self._compute_value(record)
+            self.compute_value(record)
         else:
             null = self.convert_to_cache(False, record, validate=False)
             record._cache[self] = SpecialValue(null)