diff --git a/addons/test_xlsx_export/tests/test_export.py b/addons/test_xlsx_export/tests/test_export.py
index d8a3c4eaebd..c8e032487b2 100644
--- a/addons/test_xlsx_export/tests/test_export.py
+++ b/addons/test_xlsx_export/tests/test_export.py
@@ -6,6 +6,7 @@ from unittest.mock import patch
 
 from odoo import http
 from odoo.tests import common, tagged
+from odoo.tools.misc import get_lang
 from odoo.addons.web.controllers.export import ExportXlsxWriter
 from odoo.addons.mail.tests.common import mail_new_test_user
 
@@ -373,3 +374,20 @@ class TestGroupedExport(XlsxCreatorCase):
             ['    1000.0 (1)', '1000.000'],
             ['3', '1000.00'],
         ])
+
+    def test_decimal_separator(self):
+        """ The decimal separator of the language used shouldn't impact the float representation in the exported xlsx """
+        get_lang(self.env).decimal_point = ','
+        get_lang(self.env).thousands_sep = '.'
+
+        values = [
+                {'int_sum': 1, 'float_min': 86420.864},
+        ]
+        export = self.export(values, fields=['int_sum', 'float_min'], params={'groupby': ['int_sum', 'float_min']})
+
+        self.assertExportEqual(export, [
+            ['Int Sum'          ,'Float Min'],
+            ['1 (1)'            ,'86420.86'],
+            ['    86420.864 (1)','86420.86'],
+            ['1'                ,'86420.86'],
+        ])
diff --git a/addons/web/controllers/export.py b/addons/web/controllers/export.py
index 93eaba4ad6e..e2dc55fe214 100644
--- a/addons/web/controllers/export.py
+++ b/addons/web/controllers/export.py
@@ -17,7 +17,7 @@ from odoo import http
 from odoo.exceptions import UserError
 from odoo.http import content_disposition, request
 from odoo.tools import lazy_property, osutil, pycompat
-from odoo.tools.misc import xlsxwriter, get_lang
+from odoo.tools.misc import xlsxwriter
 from odoo.tools.translate import _
 
 
@@ -183,11 +183,10 @@ class ExportXlsxWriter:
         self.datetime_style = self.workbook.add_format({'text_wrap': True, 'num_format': 'yyyy-mm-dd hh:mm:ss'})
         self.worksheet = self.workbook.add_worksheet()
         self.value = False
-        decimal_separator = get_lang(request.env).decimal_point
-        self.float_format = f'0{decimal_separator}00'
+        self.float_format = '#,##0.00'
         decimal_places = [res['decimal_places'] for res in
                           request.env['res.currency'].search_read([], ['decimal_places'])]
-        self.monetary_format = f'0{decimal_separator}{max(decimal_places or [2]) * "0"}'
+        self.monetary_format = f'#,##0.{max(decimal_places or [2]) * "0"}'
 
         if row_count > self.worksheet.xls_rowmax:
             raise UserError(_('There are too many rows (%s rows, limit: %s) to export as Excel 2007-2013 (.xlsx) format. Consider splitting the export.') % (row_count, self.worksheet.xls_rowmax))