diff --git a/src/dokuwiki.scm b/src/dokuwiki.scm
index afc9187..db944ce 100644
--- a/src/dokuwiki.scm
+++ b/src/dokuwiki.scm
@@ -75,7 +75,7 @@
     exn
     (let ()
       (log-warning "DokuWiki: cannot open ~A" fname)
-      (stdout-print "DokuWiki: cannot open ~A" fname)
+      (stdout-printf "DokuWiki: cannot open ~A" fname)
       '())
     (with-input-from-file fname
       parse-dokuwiki-users-auth)))