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-rw-r--r--gnu/services/configuration.scm5
1 files changed, 3 insertions, 2 deletions
diff --git a/gnu/services/configuration.scm b/gnu/services/configuration.scm
index 60965486a7..83da63c1b3 100644
--- a/gnu/services/configuration.scm
+++ b/gnu/services/configuration.scm
@@ -305,12 +305,13 @@ does not have a default value" field kind)))
;; Ideally this should be an implementation detail, but we export it
;; to provide a simpler API that enables unsetting a configuration
-;; field that has a maybe type, but also a default value.
+;; field that has a maybe type, but also a default value. We give it
+;; a value that sticks out to the reader when something goes wrong.
;;
;; An example use-case would be something like a network application
;; that uses a default port, but the field can explicitly be unset to
;; request a random port at startup.
-(define %unset-value 'unset)
+(define %unset-value '%unset-marker%)
(define (maybe-value-set? value)
"Predicate to check whether a 'maybe' value was explicitly provided."