diff --git a/phpunit.xml.dist b/phpunit.xml.dist
index 990910f..e400db8 100644
--- a/phpunit.xml.dist
+++ b/phpunit.xml.dist
@@ -7,7 +7,7 @@
     </testsuites>
     <filter>
         <whitelist>
-            <directory suffix=".php">tests</directory>
+            <directory suffix=".php">src</directory>
             <exclude>
                 <directory suffix="Interface.php">src/</directory>
             </exclude>