diff --git a/tests/Stripe/Service/AbstractServiceTest.php b/tests/Stripe/Service/AbstractServiceTest.php
index 0eac886d7..d4e9bd6f5 100644
--- a/tests/Stripe/Service/AbstractServiceTest.php
+++ b/tests/Stripe/Service/AbstractServiceTest.php
@@ -68,5 +68,11 @@ public function testFormatParams()
         static::assertTrue('' === $result['foo']['bar']);
         static::assertTrue(null !== $result['foo']['bar']);
         static::assertTrue(1 === $result['foo']['baz']);
+
+        $result = \Stripe\Service\AbstractService::formatParams(['foo' => ["bar", null, null, "baz"]]);
+        static::assertTrue('bar' === $result['foo'][0]);
+        static::assertTrue('' === $result['foo'][1]);
+        static::assertTrue('' === $result['foo'][2]);
+        static::assertTrue('baz' === $result['foo'][3]);
     }
 }