diff --git a/phpunit.xml b/phpunit.xml
index cb615b8a716..710a7ddf8c2 100644
--- a/phpunit.xml
+++ b/phpunit.xml
@@ -2,6 +2,7 @@
 <phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:noNamespaceSchemaLocation="phpunit.xsd"
          bootstrap="tests/bootstrap.php"
+         cacheResult="true"
          verbose="true">
     <testsuites>
         <testsuite name="unit">