diff --git a/app/templates/base.html b/app/templates/base.html
index e2c728e..4cd05b9 100644
--- a/app/templates/base.html
+++ b/app/templates/base.html
@@ -398,7 +398,10 @@
                 e.stopPropagation();
                 fetch(MARK_ALL_URL, {
                     method: 'POST',
-                    headers: { 'X-CSRFToken': CSRF_TOKEN },
+                    headers: {
+                        'X-CSRFToken': CSRF_TOKEN,
+                        'X-Requested-With': 'XMLHttpRequest',
+                    },
                     credentials: 'same-origin',
                 })
                 .then(function(r) { return r.json(); })