diff --git a/lib/filestorage/file_system_filedir.php b/lib/filestorage/file_system_filedir.php
index 75338755316..d4c72838a82 100644
--- a/lib/filestorage/file_system_filedir.php
+++ b/lib/filestorage/file_system_filedir.php
@@ -402,7 +402,7 @@ public function add_file_from_path($pathname, $contenthash = null) {
             ignore_user_abort($prev);
             throw new file_exception('storedfilecannotcreatefile');
         }
-        chmod($hashfile, $this->filepermissions); // Fix permissions if needed.
+        @chmod($hashfile, $this->filepermissions); // Fix permissions if needed.
         if (file_exists($hashfile.'.tmp')) {
             // Just in case anything fails in a weird way.
             @unlink($hashfile.'.tmp');
@@ -523,7 +523,7 @@ public function add_file_from_string($content) {
             ignore_user_abort($prev);
             throw new file_exception('storedfilecannotcreatefile');
         }
-        chmod($hashfile, $this->filepermissions); // Fix permissions if needed.
+        @chmod($hashfile, $this->filepermissions); // Fix permissions if needed.
         if (file_exists($hashfile.'.tmp')) {
             // Just in case anything fails in a weird way.
             @unlink($hashfile.'.tmp');