diff --git a/www/nyxt/files/patch-__build_idna_decode.lisp b/www/nyxt/files/patch-__build_idna_decode.lisp
new file mode 100644
index 000000000000..f7ae034b576f
--- /dev/null
+++ b/www/nyxt/files/patch-__build_idna_decode.lisp
@@ -0,0 +1,13 @@
+--- _build/idna/decode.lisp.orig	2026-06-12 10:25:38 UTC
++++ _build/idna/decode.lisp
+@@ -94,8 +94,8 @@
+       (loop with len = output-length
+             for i from 0 below len
+             do (when (elt case-flags i)
+-                 (setf (aref output i)
+-                       (char-code (char-upcase (code-char (aref output i))))))))
++                 (setf (elt output i)
++                       (char-code (char-upcase (code-char (elt output i))))))))
+     (map 'string #'code-char output)))
+ 
+ (defun to-unicode (string)