diff --git a/guile/broken-link-checker.scm b/guile/broken-link-checker.scm
index dc85b46..968b173 100755
--- a/guile/broken-link-checker.scm
+++ b/guile/broken-link-checker.scm
@@ -23,6 +23,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
  (web client)
  (web response)
  (web uri)
+ ((web http) #:select (parse-header))
  ((htmlprag) #:select (html->sxml))
  ((sxml xpath) #:select (sxpath))
  (srfi srfi-1)
@@ -177,10 +178,12 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 ;; Some sites return 403 errors for bot requests, these headers make
 ;; us look more like a real browser.
-(define request-headers '((accept . ((text/html) (application/xhtml+xml) (application/xml (q . 900)) (*/* (q . 800))))
-                          (accept-encoding . ((1000 . "gzip") (1000 . "deflate") (1000 . "br") (1000 . "zstd")))
-                          (accept-language . ((1000 . "en-GB") (500 . "en")))
-                          (user-agent . "Mozilla/5.0 (X11; Linux x86_64; rv:133.0) Gecko/20100101 Firefox/133.0")))
+(define request-headers
+  (map (match-lambda ((k . v) (cons k (parse-header k v))))
+       '((accept . "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8")
+         (accept-encoding . "gzip, deflate, br, zstd")
+         (accept-language . "en-GB,en;q=0.5")
+         (user-agent . "Mozilla/5.0 (X11; Linux x86_64; rv:133.0) Gecko/20100101 Firefox/133.0"))))
 
 ;; A memoized version of http-get. This allows us to quickly check a URL we have
 ;; seen before (when it is linked from multiple different pages) without generating