diff --git a/application/utils.inc.php b/application/utils.inc.php
index dbb595d72b..6086f3874a 100644
--- a/application/utils.inc.php
+++ b/application/utils.inc.php
@@ -155,6 +155,8 @@ class utils
 
 	private static $iNextId = 0;
 
+	private static $m_sAppRootUrl = null;
+
 	protected static function LoadParamFile($sParamFile)
 	{
 		if (!file_exists($sParamFile)) {
@@ -992,7 +994,7 @@ class utils
      */
 	public static function GetAbsoluteUrlAppRoot($bForceTrustProxy = false)
 	{
-		static $sUrl = null;
+		$sUrl = static::$m_sAppRootUrl;
 		if ($sUrl === null || $bForceTrustProxy)
 		{
 			$sUrl = self::GetConfig()->Get('app_root_url');
@@ -1013,8 +1015,9 @@ class utils
 				}
 				$sUrl = str_replace(SERVER_NAME_PLACEHOLDER, $sServerName, $sUrl);
 			}
+			static::$m_sAppRootUrl = $sUrl;
 		}
-		return $sUrl;
+		return static::$m_sAppRootUrl;
 	}
 
 	/**
diff --git a/tests/php-unit-tests/unitary-tests/application/utilsTest.php b/tests/php-unit-tests/unitary-tests/application/utilsTest.php
index 116f621c16..790991ab9f 100644
--- a/tests/php-unit-tests/unitary-tests/application/utilsTest.php
+++ b/tests/php-unit-tests/unitary-tests/application/utilsTest.php
@@ -25,7 +25,6 @@ use Combodo\iTop\Test\UnitTest\ItopTestCase;
 use utils;
 
 /**
- * @runClassInSeparateProcess
  * @covers utils
  */
 class utilsTest extends ItopTestCase
@@ -245,7 +244,6 @@ class utilsTest extends ItopTestCase
 	}
 
 	/**
-	 * @runInSeparateProcess
 	 * @dataProvider GetAbsoluteUrlAppRootPersistency
 	 */
 	public function testGetAbsoluteUrlAppRootPersistency($bBehindReverseProxy,$bForceTrustProxy1 ,$sExpectedAppRootUrl1,$bForceTrustProxy2 , $sExpectedAppRootUrl2,$bForceTrustProxy3 , $sExpectedAppRootUrl3)
@@ -274,6 +272,9 @@ class utilsTest extends ItopTestCase
 		$this->assertEquals($sExpectedAppRootUrl2, utils::GetAbsoluteUrlAppRoot($bForceTrustProxy2));
 
 		$this->assertEquals($sExpectedAppRootUrl3, utils::GetAbsoluteUrlAppRoot($bForceTrustProxy3));
+
+		// Leave the place clean
+		static::SetNonPublicStaticProperty('utils', 'm_sAppRootUrl', null);
 	}