diff --git a/lib/filelib.php b/lib/filelib.php
index d73604a39ff..30f7edf8dc7 100644
--- a/lib/filelib.php
+++ b/lib/filelib.php
@@ -2021,7 +2021,7 @@ function readfile_accel($file, $mimetype, $accelerate) {
     header('Last-Modified: '. gmdate('D, d M Y H:i:s', $lastmodified) .' GMT');
 
     if (is_object($file)) {
-        header('Etag: "' . $file->get_contenthash() . '"');
+        header('ETag: ' . $file->get_contenthash());
         if (isset($_SERVER['HTTP_IF_NONE_MATCH']) and $_SERVER['HTTP_IF_NONE_MATCH'] === $file->get_contenthash()) {
             header('HTTP/1.1 304 Not Modified');
             return;