diff --git a/tests/core/Common.test.php b/tests/core/Common.test.php
index f1526910e0d5d3fca702888cabec2a95f2261a95..82f3a2e52b5480aaf847e3db590b4c1ab7b2b828 100644
--- a/tests/core/Common.test.php
+++ b/tests/core/Common.test.php
@@ -696,9 +696,9 @@ class Test_Piwik_Common extends UnitTestCase
 		$a = 'O:31:"Test_Piwik_Cookie_Phantom_Class":0:{}';
 		try {
 			unserialize($a);
-			$this->fail("Expected exception not raised");
-		} catch(Exception $expected) {
 			$this->pass("test: unserializing an object where class not (yet) defined<br>\n");
+		} catch(Exception $expected) {
+			$this->fail("Unexpected exception raised");
 		}
 
 		$ua = Piwik_Common::unserialize_array($a);