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-rw-r--r--gnu/services/mail.scm2
1 files changed, 1 insertions, 1 deletions
diff --git a/gnu/services/mail.scm b/gnu/services/mail.scm
index c0f6371104..81f692e437 100644
--- a/gnu/services/mail.scm
+++ b/gnu/services/mail.scm
@@ -159,7 +159,7 @@
 (define (serialize-free-form-args field-name val)
   (serialize-field field-name
                    (string-join
-                    (map (match-lambda ((k . v) (format #t "~a=~a" k v))) val)
+                    (map (match-lambda ((k . v) (format #f "~a=~a" k v))) val)
                     " ")))
 
 (define-configuration dict-configuration