diff --git a/.travis.yml b/.travis.yml
index a6f2109..7933c43 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -16,4 +16,4 @@ before_script:
     - flags="-o"
     - composer install $flags
 
-script: phpunit
+script: php ./vendor/phpunit/phpunit/phpunit -c phpunit.xml.dist
diff --git a/lib/RetailCrm/Methods/V5/Costs.php b/lib/RetailCrm/Methods/V5/Costs.php
index 0b0306f..09f4f97 100644
--- a/lib/RetailCrm/Methods/V5/Costs.php
+++ b/lib/RetailCrm/Methods/V5/Costs.php
@@ -111,7 +111,8 @@ trait Costs
         /* @noinspection PhpUndefinedMethodInspection */
         return $this->client->makeRequest(
             '/costs/delete',
-            "POST"
+            "POST",
+            ['ids' => json_encode($ids)]
         );
     }