diff --git a/phpunit.xml.dist b/phpunit.xml.dist
index f978a4a..0b974d5 100644
--- a/phpunit.xml.dist
+++ b/phpunit.xml.dist
@@ -3,9 +3,14 @@
 	verbose="true">
 	<testsuites>
 		<testsuite name="altorouter">
-			<directory>./tests</directory>
+			<directory>./tests/</directory>
 		</testsuite>
 	</testsuites>
+	<filter>
+		<blacklist>
+			<directory>./vendor/</directory>
+		</blacklist>
+	</filter>
 	<logging>
 		<log type="coverage-clover" target="build/logs/clover.xml"/>
 	</logging>