diff --git a/phpunit-integration.xml b/phpunit-integration.xml
index 857be0610f6da30bb2ba587aa693b9d644c31589..fe31963657aea8edd36027ef763699d54b7fa941 100644
--- a/phpunit-integration.xml
+++ b/phpunit-integration.xml
@@ -7,6 +7,12 @@
         </testsuite>
     </testsuites>
 
+    <filter>
+        <whitelist>
+            <directory suffix=".php">classes</directory>
+        </whitelist>
+    </filter>
+
     <logging>
         <log type="junit" target="build-coverage/report.junit.xml"/>
         <log type="coverage-html" target="build-coverage/coverage" charset="UTF-8" yui="true" highlight="true"/>