diff --git a/app/Http/Controllers/InvoiceController.php b/app/Http/Controllers/InvoiceController.php
index cc0aa3b669e8..640a6503f27c 100644
--- a/app/Http/Controllers/InvoiceController.php
+++ b/app/Http/Controllers/InvoiceController.php
@@ -289,10 +289,11 @@ class InvoiceController extends BaseController
         $taxRateOptions = $account->present()->taxRateOptions;
         if ($invoice->exists) {
             foreach ($invoice->getTaxes() as $key => $rate) {
+                $key = '0 ' . $key;
                 if (isset($taxRateOptions[$key])) {
                     continue;
                 }
-                $taxRateOptions['0 ' . $key] = $rate['name'] . ' ' . $rate['rate'] . '%';
+                $taxRateOptions[$key] = $rate['name'] . ' ' . $rate['rate'] . '%';
             }
         }