diff --git a/tests/offline/mode/diff.lisp b/tests/offline/mode/diff.lisp
deleted file mode 100644
index 4be7e95bef9..00000000000
--- a/tests/offline/mode/diff.lisp
+++ /dev/null
@@ -1,10 +0,0 @@
-;;;; SPDX-FileCopyrightText: Atlas Engineer LLC
-;;;; SPDX-License-Identifier: BSD-3-Clause
-
-(in-package :nyxt/tests)
-
-(define-test toggle-diff-mode ()
-  (let ((buffer (make-instance 'modable-buffer)))
-    (with-current-buffer buffer
-      (assert-true (enable-modes* 'nyxt/mode/diff:diff-mode buffer))
-      (assert-true (disable-modes* 'nyxt/mode/diff:diff-mode buffer)))))