diff --git a/phpunit.xml.dist b/phpunit.xml.dist
index b863e18..c9b3344 100644
--- a/phpunit.xml.dist
+++ b/phpunit.xml.dist
@@ -7,6 +7,13 @@
             </testsuite>
         </testsuite>
     </testsuites>
+
+    <filter>
+        <whitelist>
+            <directory>./src</directory>
+        </whitelist>
+    </filter>
+
     <logging>
         <!-- uncoment to generate code-ceverage stats in /tmp/report: -->
         <!--<log type="coverage-html" target="/tmp/report" charset="UTF-8" yui="true" highliighlight="false" lowUpperBound="35" highLowerBound="70" />-->