diff --git a/tests/framework/web/CCookieCollectionTest.php b/tests/framework/web/CCookieCollectionTest.php
index f217421b4b..999ee90cd2 100644
--- a/tests/framework/web/CCookieCollectionTest.php
+++ b/tests/framework/web/CCookieCollectionTest.php
@@ -38,6 +38,7 @@ public function testConstructorCookieBuilding()
 	}
 	/**
 	 * @runInSeparateProcess
+	 * @preserveGlobalState disabled
 	 * @outputBuffering enabled
 	 */
 	public function testAdd()
@@ -59,6 +60,7 @@ public function testAdd()
 	}
 	/**
 	 * @runInSeparateProcess
+	 * @preserveGlobalState disabled
 	 * @outputBuffering enabled
 	 */
 	public function testRemove()
diff --git a/tests/framework/web/CHttpSessionTest.php b/tests/framework/web/CHttpSessionTest.php
index d904b028e4..cab82abf4a 100644
--- a/tests/framework/web/CHttpSessionTest.php
+++ b/tests/framework/web/CHttpSessionTest.php
@@ -16,6 +16,7 @@ protected function checkProb($gcProb) {
 	 * @covers CHttpSession::setGCProbability
 	 *
 	 * @runInSeparateProcess
+	 * @preserveGlobalState disabled
 	 */
 	public function testSetGet() {
 		Yii::app()->setComponents(array('session' => array(
diff --git a/tests/framework/web/auth/CWebUserTest.php b/tests/framework/web/auth/CWebUserTest.php
index 12e6305375..bdfec6aea4 100644
--- a/tests/framework/web/auth/CWebUserTest.php
+++ b/tests/framework/web/auth/CWebUserTest.php
@@ -31,6 +31,7 @@ public function booleanProvider()
 
 	/**
 	 * @runInSeparateProcess
+	 * @preserveGlobalState disabled
 	 * @outputBuffering enabled
 	 * @dataProvider booleanProvider
 	 */
@@ -59,6 +60,7 @@ public function testLoginLogout($destroySession)
 
 	/**
 	 * @runInSeparateProcess
+	 * @preserveGlobalState disabled
 	 * @outputBuffering enabled
 	 */
 	public function testCheckAccess()