diff --git a/admin/environment.xml b/admin/environment.xml
index 43bc5e48a85..1fc8ce1f4e3 100644
--- a/admin/environment.xml
+++ b/admin/environment.xml
@@ -1647,6 +1647,8 @@
       </PHP_EXTENSION>
       <PHP_EXTENSION name="xml" level="required">
       </PHP_EXTENSION>
+      <PHP_EXTENSION name="xmlreader" level="required">
+      </PHP_EXTENSION>
       <PHP_EXTENSION name="intl" level="optional">
         <FEEDBACK>
           <ON_CHECK message="intlrecommended" />