diff --git a/files/index.php b/files/index.php
index aa8c0fe1245..127939905c5 100644
--- a/files/index.php
+++ b/files/index.php
@@ -665,7 +665,7 @@ function displaydir ($wdir) {
     $fullpath = $basedir.$wdir;
 
     $directory = opendir($fullpath);             // Find all files
-    while ($file = readdir($directory)) {
+    while (($file = readdir($directory)) !== false) {
         if ($file == "." || $file == "..") {
             continue;
         }