diff --git a/scheme/lib/rfc822.scm b/scheme/lib/rfc822.scm
index cb0a472..73d8137 100644
--- a/scheme/lib/rfc822.scm
+++ b/scheme/lib/rfc822.scm
@@ -110,4 +110,4 @@
   (make-read-rfc822-headers read-rfc822-field-with-line-breaks))
 
 (define (rfc822-time->string time)
-  (format-date "~a, ~d ~b ~Y ~H:~M:~S GMT" (date time 0)))
+  (format-date " ~a, ~d ~b ~Y ~H:~M:~S GMT" (date time 0)))