diff --git a/bin/osv/fields.py b/bin/osv/fields.py
index 7c1a3034770..2aaa516f572 100644
--- a/bin/osv/fields.py
+++ b/bin/osv/fields.py
@@ -616,7 +616,7 @@ class function(_column):
         else:
             res = self._fnct(cr, obj._table, ids, name, self._arg, context)
         
-        if self._type == 'binary' and context.get('get_binary_size', True):
+        if self._type == 'binary' and context.get('get_binary_size', False):
             # convert the data returned by the function with the size of that data...
             res = dict(map(lambda (x, y): (x, tools.human_size(len(y))), res.items()))
         return res