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-rw-r--r--guix/ui.scm2
1 files changed, 1 insertions, 1 deletions
diff --git a/guix/ui.scm b/guix/ui.scm
index db0711bb61..938b5d259c 100644
--- a/guix/ui.scm
+++ b/guix/ui.scm
@@ -381,7 +381,7 @@ WIDTH columns."
     ;; All this just to preserve `-Wformat' warnings.  Too much?
 
     (define (augmented-format-string fmt)
-      (string-append "~:[~;guix ~a: ~]~a" (syntax->datum fmt)))
+      (string-append "~:[~*~;guix ~a: ~]~a" (syntax->datum fmt)))
 
     (define prefix
       #'(_ "warning: "))