diff --git a/tests/acceptance/TaxRatesCest.php b/tests/acceptance/TaxRatesCest.php
index 94951d8949fe..1616438d569c 100644
--- a/tests/acceptance/TaxRatesCest.php
+++ b/tests/acceptance/TaxRatesCest.php
@@ -29,7 +29,7 @@ class TaxRatesCest
         $total = $itemCost;
         $total += round($itemCost * $itemTaxRate / 100, 2);
         $total += round($itemCost * $invoiceTaxRate / 100, 2);
-        $itemTaxRate = round($itemTaxRate, 2);
+        $itemTaxRate = number_format($itemTaxRate, 2);
 
         // create tax rates
         $I->amOnPage('/tax_rates/create');