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-rw-r--r--gnu/services/vpn.scm2
1 files changed, 1 insertions, 1 deletions
diff --git a/gnu/services/vpn.scm b/gnu/services/vpn.scm
index cbb4a79a7b..4602b3f3db 100644
--- a/gnu/services/vpn.scm
+++ b/gnu/services/vpn.scm
@@ -61,7 +61,7 @@
 (define serialize-string serialize-field)
 (define (serialize-boolean field-name val)
   (if val
-      (serialize-field field-name val)
+      (serialize-field field-name "")
       (format #t "")))
 
 (define (ip-mask? val)