diff --git a/tryton/gui/window/view_form/model/field.py b/tryton/gui/window/view_form/model/field.py
index 5e4990fa3d..1ccf7353ae 100644
--- a/tryton/gui/window/view_form/model/field.py
+++ b/tryton/gui/window/view_form/model/field.py
@@ -289,7 +289,7 @@ class FloatField(CharField):
 
     def convert(self, value):
         try:
-            return locale.atof
+            return locale.atof(value)
         except ValueError:
             return self._default