diff --git a/tryton/tryton/common/number_entry.py b/tryton/tryton/common/number_entry.py
index c6eb228ef2..91a52aa011 100644
--- a/tryton/tryton/common/number_entry.py
+++ b/tryton/tryton/common/number_entry.py
@@ -53,7 +53,7 @@ class NumberEntry(Gtk.Entry, Gtk.Editable):
         value = None
         if text not in ['-', self.__decimal_point]:
             try:
-                value = Decimal(locale.atof(text))
+                value = Decimal(str(locale.atof(text)))
             except (ValueError, InvalidOperation):
                 return position
         if (value and self.__digits is not None