diff --git a/e107_core/templates/footer_default.php b/e107_core/templates/footer_default.php
index 85d65a9a6..aee5d54de 100644
--- a/e107_core/templates/footer_default.php
+++ b/e107_core/templates/footer_default.php
@@ -391,6 +391,7 @@ else
 }
 
 header("X-Powered-By: e107", true); // no less secure than e107-specific html. 
+header('Vary: Accept');
 
 // should come after the Etag header
 if ($canCache && isset($_SERVER['HTTP_IF_NONE_MATCH']))