diff --git a/tests/UnitTests/TemplateSource/ValueTests/PHPfunctions/PhpFunctionTest.php b/tests/UnitTests/TemplateSource/ValueTests/PHPfunctions/PhpFunctionTest.php
index 0556cee4..8892a542 100644
--- a/tests/UnitTests/TemplateSource/ValueTests/PHPfunctions/PhpFunctionTest.php
+++ b/tests/UnitTests/TemplateSource/ValueTests/PHPfunctions/PhpFunctionTest.php
@@ -56,6 +56,10 @@ class PhpFunctionTest extends PHPUnit_Smarty
      */
     public function testEmpty2()
     {
+        if (version_compare(phpversion(), '5.5', '<')) {
+            $this->markTestSkipped('runs only on PHP > 5.5');
+        }
+
         $this->smarty->disableSecurity();
         $this->smarty->assign('var', array(null,
                                            false,
@@ -77,6 +81,9 @@ class PhpFunctionTest extends PHPUnit_Smarty
      */
     public function testEmpty3()
     {
+        if (version_compare(phpversion(), '5.5', '<')) {
+            $this->markTestSkipped('runs only on PHP > 5.5');
+        }
         $this->smarty->disableSecurity();
         $this->smarty->assign('var', array(true,
                                            (int) 1,
@@ -96,6 +103,10 @@ class PhpFunctionTest extends PHPUnit_Smarty
      */
     public function testEmpty4()
     {
+        if (version_compare(phpversion(), '5.5', '<')) {
+        $this->markTestSkipped('runs only on PHP > 5.5');
+        }
+
         $this->smarty->disableSecurity();
         $this->smarty->assign('var', new TestIsset());
         $expected = ' true , false , false , true , true , true , false ';