diff --git a/apachesolr.admin.inc b/apachesolr.admin.inc
index d63b21c..c2da5a6 100644
--- a/apachesolr.admin.inc
+++ b/apachesolr.admin.inc
@@ -719,7 +719,7 @@ function apachesolr_config_files_overview() {
   $xml = NULL;
   try {
     $solr = apachesolr_get_solr();
-    $response = $solr->makeServletRequest('admin/file');
+    $response = $solr->makeServletRequest('admin/file', array('wt' => 'xml'));
     $xml = simplexml_load_string($response->getRawResponse());
   }
   catch (Exception $e) {