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-rw-r--r--guix/build/linux-initrd.scm2
1 files changed, 1 insertions, 1 deletions
diff --git a/guix/build/linux-initrd.scm b/guix/build/linux-initrd.scm
index 16c741f931..83636dfd73 100644
--- a/guix/build/linux-initrd.scm
+++ b/guix/build/linux-initrd.scm
@@ -285,7 +285,7 @@ run a file system check."
;; Update /etc/mtab.
(mkdir-p (string-append root "/etc"))
- (let ((port (open-output-file (string-append root "/etc/mtab"))))
+ (let ((port (open-file (string-append root "/etc/mtab") "a")))
(format port "~a ~a ~a ~a 0 0~%"
source mount-point type options)
(close-port port))))))