diff --git a/tests/PHPUnit/Unit/AssetManagerTest.php b/tests/PHPUnit/Unit/AssetManagerTest.php
index 5d3e709004d86570a88b6b0369723fab607193b1..850e820591155f8b32e5cdfdee152dec58127dad 100644
--- a/tests/PHPUnit/Unit/AssetManagerTest.php
+++ b/tests/PHPUnit/Unit/AssetManagerTest.php
@@ -251,7 +251,7 @@ class AssetManagerTest extends PHPUnit_Framework_TestCase
     {
         $this->clearDateCache();
 
-        sleep(1.5);
+        sleep(1);
 
         $modificationDate = $this->mergedAsset->getModificationDate();
 
diff --git a/tests/PHPUnit/Unit/CommonTest.php b/tests/PHPUnit/Unit/CommonTest.php
index 719333ccd9318a24638d6ed7fc4cd7c440fc3a8c..185fa064d3706c66b0e78faad47aec21189dab30 100644
--- a/tests/PHPUnit/Unit/CommonTest.php
+++ b/tests/PHPUnit/Unit/CommonTest.php
@@ -5,6 +5,8 @@ use Piwik\Filesystem;
 /**
  * Piwik - free/libre analytics platform
  *
+ * @backupGlobals enabled
+ *
  * @link http://piwik.org
  * @license http://www.gnu.org/licenses/gpl-3.0.html GPL v3 or later
  */
diff --git a/tests/PHPUnit/Unit/DataTable/Filter/PivotByDimensionTest.php b/tests/PHPUnit/Unit/DataTable/Filter/PivotByDimensionTest.php
index 9bfa6847ae367d4b27cffb519a647cecc59827a2..f1faa99b88bf89ec69d66e82ca73ce002aa4d667 100644
--- a/tests/PHPUnit/Unit/DataTable/Filter/PivotByDimensionTest.php
+++ b/tests/PHPUnit/Unit/DataTable/Filter/PivotByDimensionTest.php
@@ -181,6 +181,9 @@ class PivotByDimensionTest extends PHPUnit_Framework_TestCase
         $this->assertTableRowsEquals($expectedRows, $table);
     }
 
+    /**
+     * @backupGlobals enabled
+     */
     public function test_filter_UsesCorrectSegment_WhenPivotingSegmentedReport()
     {
         $this->loadPlugins('Referrers', 'UserCountry', 'CustomVariables');
diff --git a/tests/PHPUnit/Unit/IPTest.php b/tests/PHPUnit/Unit/IPTest.php
index f12d37dfed2ef711fcefc98275591bb3ea6e9f92..ebaf8eb0ff2aafe3276528dac051bd16be374d77 100644
--- a/tests/PHPUnit/Unit/IPTest.php
+++ b/tests/PHPUnit/Unit/IPTest.php
@@ -7,6 +7,8 @@ use Piwik\SettingsServer;
 /**
  * Piwik - free/libre analytics platform
  *
+ * @backupGlobals enabled
+ *
  * @link http://piwik.org
  * @license http://www.gnu.org/licenses/gpl-3.0.html GPL v3 or later
  */
diff --git a/tests/PHPUnit/Unit/NonceTest.php b/tests/PHPUnit/Unit/NonceTest.php
index 9d0d8ef37db27d36f36679623a45e8d64ad2946e..6a9a90994c3e1e4ba2d272dfbbdf7f2bbd42cb19 100644
--- a/tests/PHPUnit/Unit/NonceTest.php
+++ b/tests/PHPUnit/Unit/NonceTest.php
@@ -5,6 +5,8 @@ use Piwik\Nonce;
 /**
  * Piwik - free/libre analytics platform
  *
+ * @backupGlobals enabled
+ *
  * @link http://piwik.org
  * @license http://www.gnu.org/licenses/gpl-3.0.html GPL v3 or later
  */
diff --git a/tests/PHPUnit/Unit/UrlTest.php b/tests/PHPUnit/Unit/UrlTest.php
index bbde99278583370c26a084e964164852fd788eea..3c2bafe73eff7c0e3d3afa4cfca4838e9385d49b 100644
--- a/tests/PHPUnit/Unit/UrlTest.php
+++ b/tests/PHPUnit/Unit/UrlTest.php
@@ -5,6 +5,8 @@ use Piwik\Url;
 /**
  * Piwik - free/libre analytics platform
  *
+ * @backupGlobals enabled
+ *
  * @link http://piwik.org
  * @license http://www.gnu.org/licenses/gpl-3.0.html GPL v3 or later
  */