diff --git a/lisp/acdw.el b/lisp/acdw.el
index d806138..d043aad 100644
--- a/lisp/acdw.el
+++ b/lisp/acdw.el
@@ -433,47 +433,46 @@ Prompt only if there are unsaved changes."
 I used `xr' (not included in Emacs) to get the RX form of the
 default, so I can easily splice the list into it.  THIS IS
 BRITTLE AF!!!"
-  (rx
-   (seq word-boundary
-        (group
+  (rx-to-string                         ; thanks wgreenhouse!
+   `(seq word-boundary
          (group
-          (or "www."
-              (seq
-               (group
-                (eval (cons 'or acdw/button-protocols)))
-               ":")))
-         (opt
-          (group "//"
-                 (one-or-more
-                  (any "0-9a-z" "._-"))
-                 ":"
-                 (zero-or-more
-                  (any "0-9"))))
-         (or
-          (seq
-           (one-or-more
-            (any "0-9a-z" "!#$%&*+,./:;=?@\\_~-" word))
-           "("
-           (one-or-more
-            (any "0-9a-z" "!#$%&*+,./:;=?@\\_~-" word))
-           (zero-or-more
-            (any "0-9a-z" "#$%&*+/=@\\_~-" word))
-           ")"
-           (opt
+          (group
+           (or "www."
+               (seq
+                (group (or ,@acdw/button-protocols))
+                ":")))
+          (opt
+           (group "//"
+                  (one-or-more
+                   (any "0-9a-z" "._-"))
+                  ":"
+                  (zero-or-more
+                   (any "0-9"))))
+          (or
+           (seq
             (one-or-more
              (any "0-9a-z" "!#$%&*+,./:;=?@\\_~-" word))
-            (any "0-9a-z" "#$%&*+/=@\\_~-" word)))
-          (seq
-           (one-or-more
-            (any "0-9a-z" "!#$%&*+,./:;=?@\\_~-" word))
-           (any "0-9a-z" "#$%&*+/=@\\_~-" word)))))))
+            "("
+            (one-or-more
+             (any "0-9a-z" "!#$%&*+,./:;=?@\\_~-" word))
+            (zero-or-more
+             (any "0-9a-z" "#$%&*+/=@\\_~-" word))
+            ")"
+            (opt
+             (one-or-more
+              (any "0-9a-z" "!#$%&*+,./:;=?@\\_~-" word))
+             (any "0-9a-z" "#$%&*+/=@\\_~-" word)))
+           (seq
+            (one-or-more
+             (any "0-9a-z" "!#$%&*+,./:;=?@\\_~-" word))
+            (any "0-9a-z" "#$%&*+/=@\\_~-" word)))))))
 
 (defun acdw/add-button-url-regexp-protocol (proto)
   "Add PROTO to `browse-url-button-regexp'
 First, add PROTO to `acdw/button-protocols'.
 Then, build `browse-url-button-regexp' with the new protocol."
   (add-to-list 'acdw/button-protocols proto)
-  (setq browse-url-button-regexp (acdw/build-button-url-regexp)))
+  (setq-default browse-url-button-regexp (acdw/build-button-url-regexp)))