diff --git a/guix-data-service/web/query-parameters.scm b/guix-data-service/web/query-parameters.scm
index dbf2e65..41e9beb 100644
--- a/guix-data-service/web/query-parameters.scm
+++ b/guix-data-service/web/query-parameters.scm
@@ -40,6 +40,7 @@
             query-parameters->string
 
             parse-datetime
+            parse-checkbox-value
             parse-result-limit))
 
 (define (parse-query-string query)
@@ -161,6 +162,7 @@
   (define (value->text value)
     (match value
       (#f "")
+      (#t "on")
       ((? date? date)
        (date->string date "~1 ~3"))
       (other other)))
@@ -191,6 +193,9 @@
     (lambda (key . args)
       (make-invalid-query-parameter s #f))))
 
+(define (parse-checkbox-value s)
+  (string=? s "on"))
+
 (define (parse-result-limit s)
   (match (string->number s)
     (#f (make-invalid-query-parameter s #f))