diff --git a/tests/DomainZones/DomainZonesTest.php b/tests/DomainZones/DomainZonesTest.php
index 113d765c..5d837b9b 100644
--- a/tests/DomainZones/DomainZonesTest.php
+++ b/tests/DomainZones/DomainZonesTest.php
@@ -1063,6 +1063,7 @@ class DomainZonesTest extends TestCase
 	{
 		global $admin_userdata;
 
+		ob_start();
 		// get customer
 		$json_result = Customers::getLocal($admin_userdata, array(
 			'loginname' => 'test1'
@@ -1077,12 +1078,14 @@ class DomainZonesTest extends TestCase
 		$result = json_decode($json_result, true);
 		$this->assertTrue($result['data']);
 		$this->assertEquals(200, http_response_code());
+		ob_end_clean();
 	}
 
 	public function testCustomerDomainZonesDeleteUnmodified()
 	{
 		global $admin_userdata;
 
+		ob_start();
 		// get customer
 		$json_result = Customers::getLocal($admin_userdata, array(
 			'loginname' => 'test1'
@@ -1097,5 +1100,6 @@ class DomainZonesTest extends TestCase
 		$result = json_decode($json_result, true);
 		$this->assertTrue($result['data']);
 		$this->assertEquals(304, http_response_code());
+		ob_end_clean();
 	}
 }