diff --git a/addons/web/static/src/js/formats.js b/addons/web/static/src/js/formats.js
index 3ab972f7a86..ca540844b7f 100644
--- a/addons/web/static/src/js/formats.js
+++ b/addons/web/static/src/js/formats.js
@@ -27,14 +27,8 @@ openerp.web.format_value = function (value, descriptor, value_if_empty) {
             return _.sprintf('%d', value);
         case 'float':
             var precision = descriptor.digits ? descriptor.digits[1] : 2;
-            var int_part = Math.floor(value);
-            var dec_part = _.sprintf(
-                    '%.' + precision + 'f',
-                    Math.abs(value) % 1).substring(2);
-            return _.sprintf('%d%s%s',
-                    int_part,
-                    openerp.web._t.database.parameters.decimal_point,
-                    dec_part);
+            return _.sprintf('%.' + precision + 'f', value)
+                .replace('.', openerp.web._t.database.parameters.decimal_point);
         case 'float_time':
             return _.sprintf("%02d:%02d",
                     Math.floor(value),
diff --git a/addons/web/static/test/formats.js b/addons/web/static/test/formats.js
index 3c3c6b06e72..8fc5abed42e 100644
--- a/addons/web/static/test/formats.js
+++ b/addons/web/static/test/formats.js
@@ -39,6 +39,8 @@ $(document).ready(function () {
               '1.000000');
         equal(openerp.web.format_value(1, {type: 'float'}),
               '1.00');
+        equal(openerp.web.format_value(-11.25, {type: 'float'}),
+              "-11.25");
     });
     test("parse_datetime", function () {
         var val = openerp.web.str_to_datetime("2009-05-04 12:34:23");