diff --git a/phpunit.xml b/phpunit.xml
index 91156f6..059b81c 100644
--- a/phpunit.xml
+++ b/phpunit.xml
@@ -14,4 +14,9 @@
     testdox="true"
     timeoutForSmallTests="1" timeoutForMediumTests="10" timeoutForLargeTests="60"
     verbose="true">
+        <testsuites>
+            <testsuite name="tests">
+                <directory>tests/</directory>
+            </testsuite>
+        </testsuites>
 </phpunit>