diff --git a/nyxt.asd b/nyxt.asd
index b8e59bf6919..5e3074ec427 100644
--- a/nyxt.asd
+++ b/nyxt.asd
@@ -363,6 +363,7 @@
   :components ((:file "renderer-package")
                (:file "renderer-offline/set-url")
                (:file "renderer-offline/execute-command-eval")
+               (:file "renderer-offline/register-custom-scheme")
                (:file "renderer-offline/nyxt-url-security")
                (:file "renderer-offline/search-buffer")
                ;; See https://github.com/atlas-engineer/nyxt/issues/3172
diff --git a/tests/renderer-offline/register-custom-scheme.lisp b/tests/renderer-offline/register-custom-scheme.lisp
new file mode 100644
index 00000000000..425cf9a6158
--- /dev/null
+++ b/tests/renderer-offline/register-custom-scheme.lisp
@@ -0,0 +1,22 @@
+;;;; SPDX-FileCopyrightText: Atlas Engineer LLC
+;;;; SPDX-License-Identifier: BSD-3-Clause
+
+(in-package :nyxt/tests/renderer)
+
+(nyxt:define-internal-scheme "test"
+    (lambda (url)
+      (declare (ignore url))
+      (spinneret:with-html-string (:p (format nil "pass")))))
+
+(define-test register-custom-scheme ()
+  (let ((ready-channel (nyxt::make-channel 1)))
+    (nyxt:start :no-config t :no-auto-config t :headless t
+                :socket "/tmp/nyxt-test.socket" :profile "test")
+    (with-current-buffer (nyxt:make-buffer-focus :url "test:test")
+      (hooks:once-on (nyxt:buffer-loaded-hook (current-buffer)) (buffer)
+        (calispel:! ready-channel t))
+      (calispel:? ready-channel)
+      (sleep 1)
+      (assert-equal "pass"
+                    (nyxt:ps-eval (ps:chain (nyxt/ps:qs document "p") inner-text))))
+    (nyxt:quit)))