diff --git a/run-tests.php b/run-tests.php
index 909a8ea9b7b..5adfcd29915 100755
--- a/run-tests.php
+++ b/run-tests.php
@@ -3504,6 +3504,8 @@ function junit_path_to_classname($file_name)
 {
 	global $JUNIT;
 
+	if (!junit_enabled()) return '';
+
 	$ret = $JUNIT['name'];
 	$_tmp = array();