diff --git a/test/classes/PMA_Config_test.php b/test/classes/PMA_Config_test.php
index 991765a530..3e48383d1d 100644
--- a/test/classes/PMA_Config_test.php
+++ b/test/classes/PMA_Config_test.php
@@ -69,11 +69,11 @@ class PMA_ConfigTest extends PHPUnit_Framework_TestCase
         $this->object->checkOutputCompression();
         $this->assertEquals('auto', $this->object->get("OBGzip"));
 
-        ini_set('zlib.output_compression', 'Off');
+        @ini_set('zlib.output_compression', 'Off');
         $this->object->checkOutputCompression();
         $this->assertFalse($this->object->get("OBGzip"));
 
-        ini_set('zlib.output_compression', 'On');
+        @ini_set('zlib.output_compression', 'On');
     }
 
     public function testCheckClient()