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-rw-r--r--gnu/services/audio.scm2
1 files changed, 1 insertions, 1 deletions
diff --git a/gnu/services/audio.scm b/gnu/services/audio.scm
index 630110db2a..d55b804ba9 100644
--- a/gnu/services/audio.scm
+++ b/gnu/services/audio.scm
@@ -160,7 +160,7 @@
(define mpd-serialize-boolean mpd-serialize-field)
(define (mpd-serialize-list-of-string field-name value)
- #~(string-concatenate #$(map (cut mpd-serialize-string field-name <>) value)))
+ #~(string-append #$@(map (cut mpd-serialize-string field-name <>) value)))
(define-maybe string (prefix mpd-))
(define-maybe list-of-string (prefix mpd-))