diff --git a/tests/RUNNING_TESTS.md b/tests/RUNNING_TESTS.md
index 439415d45a..81d7516c0b 100644
--- a/tests/RUNNING_TESTS.md
+++ b/tests/RUNNING_TESTS.md
@@ -145,7 +145,7 @@ Slow tests
 
 Certain tests, such as the DNS tests tend to be slow.
 Thus these tests are in the `slow` group, which is excluded by default. You can
-enable slow tests by copying the phpunit.xml.all file to phpunit.xml. If you
+enable slow tests by copying the phpunit.xml.dist file to phpunit.xml. If you
 only want the slow tests, run:
 
     $ phpBB/vendor/bin/phpunit --group slow