diff --git a/phpunit.xml.dist b/phpunit.xml.dist
index b375637..5271264 100644
--- a/phpunit.xml.dist
+++ b/phpunit.xml.dist
@@ -1,6 +1,8 @@
 <?xml version="1.0" encoding="UTF-8"?>
 
-<phpunit backupGlobals="false"
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:noNamespaceSchemaLocation="vendor/phpunit/phpunit/phpunit.xsd"
+         backupGlobals="false"
          colors="true"
          beStrictAboutTestsThatDoNotTestAnything="false"
          bootstrap="./test/bootstrap.php">