diff --git a/setup/test/tests/stubs.php b/setup/test/tests/stubs.php
index 1a40562c49f4fb02f8ad8a02214f617fe0c350fc..f747ee7b5a8e778f9199e37406603ead42ee5e17 100644
--- a/setup/test/tests/stubs.php
+++ b/setup/test/tests/stubs.php
@@ -91,6 +91,7 @@ class Phar {
 
 class ZipArchive {
     function statIndex() {}
+    function addFromString() {}
     function getFromIndex() {}
 }