diff --git a/app/Providers/AppServiceProvider.php b/app/Providers/AppServiceProvider.php
index f723c2c48875..1e06822f18a2 100644
--- a/app/Providers/AppServiceProvider.php
+++ b/app/Providers/AppServiceProvider.php
@@ -204,8 +204,8 @@ class AppServiceProvider extends ServiceProvider
         Validator::extend('valid_invoice_items', function ($attribute, $value, $parameters) {
             $total = 0;
             foreach ($value as $item) {
-                $qty = ! empty($item['qty']) ? $item['qty'] : 1;
-                $cost = ! empty($item['cost']) ? $item['cost'] : 1;
+                $qty = ! empty($item['qty']) ? Utils::parseFloat($item['qty']) : 1;
+                $cost = ! empty($item['cost']) ? Utils::parseFloat($item['cost']) : 1;
                 $total += $qty * $cost;
             }